Well after spending a couple of hours with the search menu and not finding what I needed I decided to make a post and see if anyone has ideas. The tach is not working in the 1988 Formula 350, and here is the background up to before it stopped. The guy I got the car from was driving one night when all of a sudden the car just died. He tried to start it again and that didn't work. He took it too the shop and they replaced the distributor cap and rotor and then it ran for 2 days. Then it died on him again and he took it back to the same shop and they replaced the distributor. After that the car ran great, but the tach did not work. I told him to take it back and have them fix it, but he is lazy and didn't. Now I have the car and I would like to fix it myself and not rely on an unreliable shop. I have checked connections and everything appears to be together. I have not looked under the dash or had it apart yet. So where do I go from here. Any and all suggestions would be greatly appreciated. Thanks. - Blue

 

Check the white wire that goes into the gray connector on the ignition coil. That is the wire for the tachometer.

 

Thanks, I will check that out.

 

Well, I checked the white wire and it seems to be fine. I unplugged the connections to the coil and then replugged them. This is annoying, but eventually I'll fix it.

 

Here is a simple test for it.
1. unplug that gray connector at the ignition coil and turn the key to the "ON" position and using a digital multimeter. Measure between the white wire and a good ground. If you get more than 10 volts DC replace the tachometer.

2. If you get less than 10 volts DC and the battery is fully charged, then you need to check the wiring from that connector to the instrument panel.

 

Thanks, I appreciate it. Some how I have a feeling though that it has to do with the wiring and not the guage itself. The car used to have the 5" Monster Tach w/ shift lite from Autometer connected to it also. They both worked at the same time, so I am assuming that the previous owner wired them up under the dash and maybe the connection just came loose. This guy didn't always keep a clean look to the car. Most of the connections like for example the radio wires were cut and then held together with just electrical tape. - Blue