Tach question

[68EFIvert]

I have a 68 and converted to and EFI system. I am using a tach guage from retro gauge (2" that fits in the bezel). I am having problems with the guage working. i know it is getting power but it is not showing a signal. Retro Guage has been helpful by telling me the signal is probably different. Does anyone have any ideas on how to fix this interface problem? I am running a harness from fordfuelinjection.com which is based on the Ford harness, just eliminating all the excess wiring. Thanks.

 

[ForceFed70]

You'll need to tell us which ford EFI system you are running.

Where are you getting your tach signal from? If it's the TFI ignition you should have a wire connected to the - terminal of your ignition coil.

 

[68EFIvert]

I am running a Ford EFI. I have a lead that comes from the harness that is specific for a tach signal. The engine is from a 1990 GT. I have an MSD coil that has the connector for the computer harness so there is not the traditional +/- terminals but there is a green and a red wire that go into the plug. I assume the red must be the +. The harness is from Fordfuelinjection.com. Has anybody used this harness before and if so how did you solve the problem?

 

[suki243]

umm from my own installation I used the red for the + lead from the battery, the black as a ground, and the green to the - terminal from the ignition coil

 

[68EFIvert]

I figured it out........ I had a bad connection for the power wire.