Malfunctioning Charging System

All About Car Restoration How to Use and Interpret a Vacuum Gauge Few tools or test devices are more useful and versatile than a vacuum gauge, yet very few hobbyists own one. A vacuum gauge can tell as much about the internal and external workings of an engine as the combination of a voltmeter, compression gauge, stethoscope and timing light. An engine’s vacuum readings can tell an awful lot about its running parameters, provided you know how to read the gauge in the first place. Unfortunately, most vacuum gauge manufacturers don’t provide easy-to-follow instructions and diagrams to help users interpret gauge readings, rendering the gauges themselves virtually useless. We’re here to change all that, so follow along with us on a tour of vacuum gauge readings and we’ll show you all the neat things you can do with one. That pressure corresponds to the weight of air holding a column of mercury Vacuum is by definition: In engines, of course, the air is being sucked in by the vacuum created by the movement of the pistons. The Gauge Face All vacuum gauge faces are graduated in inches of mercury, although some have additional scales in millimeters of mercury.

how do i hook up a rpm gauge Page: 1

The new cluster from a junkyard has a tach and a clock; don’t know its year or model, but it’s an exact fit for the old one that had no tach. All the cable plugs were there, they fit and everything except the tach worked immediately. On my truck the signal wire is white with red splotchs, but colors may vary by year.

I could not trace where this wire goes and it seemed to be dead, so I started to search for a signal.

The steps for the power supply and ground wires on all tachometers are the same.

Installation Instructions A tachometer is a good addition to any vehicle equipped with a manual transmission. Installation of the Autogage Tachometer was fairly simple with only minor wiring including a wire to the distributor, a good ground, a 12 volt switched power source and a wire to power the tach’s light.

The following write-up is an overview of the installation I followed and includes a few illustrations from the installation guide provided from Autogage. To change the tach to operate on 4 or 6 cylinder engines, a pair of dip switches are located within the tach to make the adjustment. To get to the cylinder dip switches you have to remove rear cup by placing the tachometer face down on.

A phillips screw retains the cup so remove that screw located on the back. Gently lift the cup off to expose the circuit boards. Careful not to pull on the wires. Locate the dips switches on the circuit board. Move each of the two switches to the proper cylinder selection according to the diagram illustration on the right. Switch 2 up 8 Cyl.

Wiring the Tachometer Connect the tachometer wires as shown in the wiring diagrams below, which are typical installations.

Troubleshooting Teleflex Tachometer Gauges

I drilled out the plug, and put a 12 gauge wire in the hole, long enough to reach the face of the connector. With the 12awg wire being so dense, there is no way the pin could not make great contact. This wire is on Pin 34, which is right in one of the square connector’s corners. You’ll see it right away. Personally, after helping A LOT of people who mistakingly cut the wrong wire with the EEC diode tap method, I now highly recommend you wire the tach adapter to this location instead and save yourself any headache.

Here is a schematic of how the AM needs to be wired in the ignition system; ‘ ’02; ‘ ’04; Wiring the tach adapter is simple!

Obviously, if you see from the vacuum gauge that there might be a worn head gasket, rings, or anything else – you’ll save yourself a ton of headaches down the road.

Tachometers Diesel Tachometer Guide Diesel Diesel tachs may require a sender, depending on the engine. These tachs are offered in “dedicated” specific sender type versions. Engine has No Provision for Tach Sender: Diesel Alternator tachs read the alternator signal. If there’s no tap, a local alternator repair shop can usually add one at a small cost. You need to know the number of magnetic poles in your alternator.

Consult the alternator maker or local alternator repair shop if in doubt. Also, calculate the pulley ratio from crankshaft to alternator. Tachometers are factory calibrated for several combinations of poles and pulley ratios, but in almost all cases you will need a Portable Master Shop Tachometer for initial calibration. Detailed calibration and adjustment procedures are documented in instructions included with Teleflex tachometers. To determine if programmable tachometer is suitable for the application, calculate Full Scale Frequency FSF as follows: Engine has Magnetic Proximity Sender Mount:

Can i hook up a shift lite to stock tach

In the vein of Project X, the AMD Chevelle started with an extensive ground up restoration, with the overall goal to make it a long-term test project car. With the original long gone, we built and installed a. Next up was a set of Edelbrock aluminum cylinder heads. Problem was the car had never been to the strip and we wanted to see what we were starting with. Although the Auto Meter tach was installed temporally the wiring we did was done to last for the long run.

Testing the Circuit This is the circuit I’ve built.

However, before I begin, let me catch you up to date, especially important for those of you who aren’t quite up to speed. I’ve been one of the people asking this question, and it’s been long reported to me that the FIP trucks had a wiring harness with a ‘shunt’, which powered the ammeter. However, my findings today show differently. As Dirty Harry once said, “A man’s got to know his limitations” After I explained the basics on Ford’s setup, we set out to find out all we could. And I should mention, he was very patient with me today, trying to help me understand a lot of the basics I’m going to to my best to try to explain what I learned today here, but since I’m still up up to the ‘apprentice automotive electrician’ level yet, some of what I transcribe here might take a little tweaking in the future for better clarity.

First of all, I’m not entirely sure whether I was simply misunderstanding other’s descriptions of a shunt or whether it was a general misconception, but if I WAS understand correctly, then we’re going to need to ‘un-learn’ what we thought we knew about the ammeter in Ford pickups. Some of us or just me? However, a shunt is not an object, per se To “shunt” something means to divert.

The Ford ammeter is not a true ammeter


Report galtiero answered 3 years ago Just went through this with a sierra 5. Even though the truck had extremely low mileage and oil changes were routinely done sediment had built up in the engine. I would not count on it being a faulty sending unit.

A phillips screw retains the cup so remove that screw located on the back.

A cheap tachometer for the lathe Work in progress This is a cheap project for a tachometer for the mini-lathe. Making the interrupter wheel The digital frequency meter measures pulses per second. So the needed interrupter wheel must have 60 teeth. Without a mill or rotary table, decided to improvise a simple indexer to cut the teeth on the lathe using a slitting saw on the lathe spindle. For making a interrupter wheel there is no need for accuracy, so this will work ok.

The wheel for the tachometer is a 60mm aluminium disk, 2mm thick and bored to fit the spindle. A 60mm wheel has a Made a template with 60 divisions on computer and printed it on self adhesipe paper. The very basic indexer is shown above. A pivot with a M10 threaded end is firmly bolted on compound by using a lathe chuck. The wheel is secured centered between the two large steel parts, tightened by a M8 bolt.

Tachometer hook up

The key is understanding what your gauge is trying to tell you. You can hook a tee-fitting into an existing vacuum source or pull a line, such as one that leads to your transmission. Check to make sure all vacuum hoses are connected and not leaking.

There are two, one at each end of the blade, and they should be matched exactly.

It is true that on many F ‘s that there is no wire for pin 48 and there’s not even a hole for the wire to go into. However when you take the PCM connector off you can see there is in fact a pin behind where the wire would go on the firewall male connection. BTW when take the connector off and turn it towards you you can see the holes are numbered at each end of each row. In my case the row ended in 52 so I counted back 4. There is wire for pin 47 and 49 but no hole on 48 for a wire to even go into BUT If you look where wire 48 would go if there was in fact a wire there that there is in fact a pin on the fire wall male connection.

That’s your tach pin. Trick is to get a wire on there. One option to to access PCM from passenger side inside under the dash and get to the connector from the inside of the vehicle. That did not seem like an easy job to me but if you took the time you can get at it. In my case I just drilled a hole right where the hole should be on the female pcm connector.

So now the female connector for pin 48 at least has a hole to put a wire in. Make sure hole is clean I used a wire from my accessory connector from my remote start that I wouldn’t be using. Same size wire I carefully took it out from the remote start connector so it had the end for the pin to slip into.

Upgrading to Smartcraft gauges

A Magneto is a generator which generates alternating current AC , a normal automobile system uses direct current DC. These two demons affect the newer model of tachometers. Most manufacturers now use a different type of instrument than the ones they used years ago. Which seemed to work well.

It is much easier to replace them now then when the dash cluster is re-installed.

Many later models use a “directly coupled” tachometer. I can’t provide any information about those since I’ve never owned or worked with one. There is an existing light and power sub-harness that connects two lights to this segment of the instrument panel and provides power to the factory clock or tachometer when installed. The BLUE wire is not switched by design. This existing wiring should work perfectly. I used it instead and everything worked perfectly.

Be sure to read the “Inductive Coupling Loop” discussion further down the page. The tachometer has the following circuits: You should also notice in the above picture of the back of the tach that there is a small potentiometer about 5:

Analog Tach Hook

Congratulations on your progress! Considering not that long ago the engine wouldn’t even run, having the engine running with water coming out the exhaust and the propeller spinning must really make you happy. Just don’t spin the propeller for too long at a time since there isn’t any water to cool the shaft packing when the boat is sitting on a trailer.

Regarding the tachometer wire, the tachometer should have three wires connected to it.

Wiring connecting sender to gauge; 3.

Originally Posted by Mako68 I installed a 1 wire alternator in place of a 3 wire and did not have to use any new wireing. I just used the existing hot lead that ran to my alternator. Since it goes down to my Starter and bolts up to the battery cable there, its like running a direct wire to the battery. Doing it this way , you wouldnt need to run a new wire all the way to your battery.

Doc here, If the remote starter is configured such as to remove all power to the local solenoid Starter mounted when The Key is relaxed from the Start position back to “Run”.. Installing your Charging wire there, will result in dead batterys.. If your 1 wire upgrade was one such as, amp from a 63 Amp, usual stock rated is 63 amp Chances are that “Existing Wire” is way underrated for the “possibility” of maximum load that could be delivered by the Alternator..

DIY Wire a Tachometer on your Alto