2007 BF90D tach reads zero but runs fine

2007 BF90D tachometer reads zero but runs good?? It reads ok sometimes on initial start but after a few seconds it reads zero. No obvious wiring issues. Any ideas? Thanks

Hopefully, you can get it to fail for a while, so you can test it.

Here is a link to a Faria site that explains how to troubleshoot a tachometer. If you have 12v at the gauge and a signal voltage at the gauge, then the gauge is the problem. If not, then it is happy hunting. http://faria-instruments.com/site_manuals/IS0100_Tachometers.pdf

If you have power but no signal, then trace the grey lead and all the connections between the tach and the engine. It is probably just a bad/corroded connection. There will be a connection where the tach wiring connects to the key switch harness; then where the key switch harness connects to the main wiring harness; then where the wiring harness connects to the engine (14 pin round connector); and then to the ECU.

Mike

Thanks. I'll check it out this weekend.

I traced out the tach signal wire and couldn't find any issues. Fired it up and it's been working fine for a month. I must have wiggled the wire just right. I'm sure it will raise its head again at the least convienent time! Thanks for the help Mike

Hugh

You must have the "magic" touch!

Next time it fails....it is time for the "wiggle" test.

Mike