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« on: March 21, 2012, 02:21:08 AM »
1. Signal, Power, and Ground to the Tach is via the circuit board and housing.
2. Were the threads in the manifold OK? Was a lot of thread sealant used? Cross threaded? The sensor doesn't have to be all the way down flush. But the probe should be in the stream. You can mark it now, back it out, and see how far it actually screwed in...
3. 67 AIM UPC D55, sheet A6 says (what I assume is) the ground wire is screwed into an "Existing hole in Underbody". The hole appears to be in front of the console and on the top left side of the tunnel.?.? Is that where your ground wire is located in the harness (close to heater duct)? '68s have a ground wire that screws into the tunnel near the shifter hole.
4. The temp sender wire goes from gauge harness, to fuse block, is part of the engine harness, and runs along the intake/valve cover to the sensor. It should be part of the harnesses and not separate.