Electrical - tach & fuel guage intermittent

Any ideas where the bad connection that would cause both the tach and fuel guage to read zero once in awhile? Bad connection for sure, but where's the commonality for these two? I have the 3 Chinese guage style.

Maybe both are linked to the same poor-loose ground conection ?

Get under the dash and visualy chase those wires. I'm betting on a bad ground also.

au contrare, mis amigos:

BOTH the fuel sender and the tach are ground actuated. That means that there is +12V DC applied to the gauge all the time, and the "signal" that drives the gauge is a ground signal - through the sender to ground for fuel, and through the distributor to ground for the tach.

I suspect the opposite - there is a +12V feed up under the dash which is common to BOTH the tach and fuel gauges and it has come loose and is now intermitent.

The fix is the same, though......get up under the dash, find where +12V feeds the tach and the fuel gauge and follow it back through it's various connections to make sure they're all tight. I bet you'll find that the feed is common to both somewhere.

gn

Ya ! I believe that GN is right on this, I am quick to blame grounds for everything ~ Alan

THAT'S the advice I was looking for! So there is a common positive between the two. That should narrow down the search and save my cramped neck while doing my "Speedster yoga" to get in there. Thanks!

Only takes a few minutes to remove the seat and it makes it a lot easier to do a dash dive!