You all know how much "whining" I done over these gauges not working, All 3 dead.
Checked wiring. Good
ICVR. Good pulsing
Gauges them selves bench tested with gas sender.. good, all working.
Put it all back together....Gauges dead!

Remove and test Ignition switch. Good. Put back together....Dead....

Tear off the instrument cluster again, trace the Printed board around all the way to the Tach. Found it! PCB wear mark through the power line!
Solder in a patch. putting it back together now.........

 

Good luck, sounds confusing to me. But then again I'm not good with electrical stuff

 

Makes perfect sense to me - a broken trace is not unusual on those PCB's. And a soldered-in jumper is the right way to fix it.

 

And it works too!!
Now on to crossmember and new gas tank and straps.
Then when that's done, now I will install the New Edelbrock 4V and 2121 intake.
Then say bye-bye to TFI and emissions crap, Still rolling the dice on Duraspark vs one wire HEI.

 

Congrat's!

 

Excellent job!

 

Thanks! makes it worth it to continue

 

Isn't it a nice feeling to figure out and fix the true cause of a problem.