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Discussion Starter #1
Here's what I got so far:



I'm guessing I'm missing a ground, and obviously the bottom bulb. I'm not concerned about the hi beams yet.

1. Do any wires need to be connected to the back of the tach on the left?

2. Seems like there should be a wire going to the top right of the harness, which is connected via the pcb to the farthest right dash light. Should I just splice the gray wire that's already there and add another terminal going to the harness?

Seems like there's a bunch of posts with nothing connected to them!
 

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the ground on both 67 and 68 are problematic, most add a good ground with a lead to the frame. The original is the paperclip looking thing.

The tachometer if wired through the connector gets to the tach via the PCB. You can hook direct to the stud if the PCB is old and brittle or cracked but yours looks smooth and new.
 

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Discussion Starter #4
I cranked the motor for the first time today, but the tach didn't work. Dash lights are good.

With the key in the second click to the right position (eng not running) the top post is getting 12v (white wire, from coil). The bottom left post isn't showing anything.



Thoughts?
 

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Discussion Starter #5
Should the 12v wire measure 12v when the key is in the run position? The white (coil) wire measures 12, but nothing from the pink wire.
 

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Pink is for the fuel gauge or do you have console gauges? If console yes then the pink gets rerouted to the console harness.

The stud at the 12 o'clock position of the rear of the Tachometer side is where the tan coil sender wire should be attached if bypassing the PCB and connector for debugging testing. Trace the connector and PCB for that connection with a meter.

The stud at the 4 o'clock position is the clock power feed, and gets constant 12 volt source from the fuse panel.

The case gets grounded by the paperclip looking top mounting screw, but most folks ground the whole unit using an additional lead from the screw top right by the connector to the dash frame.
 

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Discussion Starter #8
You know what helps the voltage get to that terminal? A 5 amp fuse!

In all my previous troubleshooting, I had removed it, but never replaced. Thanks for the guidance...it was a quick find with your suggested disciplined approaches to troubleshooting.
 
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