Well my new dashboard circuit board arrived yesterday.
So today I pulled the gauge cluster out...Bit of a learning curve on my 67 Coronet. But went slowly and nothing broke. Note to anyone doing it. Disconnect the neg battery lead! OPEN the glovebox! to get the cluster out on the 67's (and I guess the 66's too) the ENTIRE fascia tilts out, from the glovebox side (right) to the far left! So removal of the radio buttons, heater/ac knobs all have to come off. The radio also has 2 securing nuts for each knob, that secure the radio to the fascia. Take them off too, otherwise you will find yourself trying to pull the radio out as well.
Some posts I have read say to drop the steering column right down to the seat..I did not need to. I loosened all the bolts, and it moved down maybe an inch or maybe 2 at most. Nearly forgot..DISCONNECT the Speedo FIRST!
The whole assembly just wanted to tilt forward, I had to lever a bit at the top as it comes out TOP first, there is a deep flange or lip on the lower edge, so tilt it out top first towards you. Once the top is clear, I found that once I loosened the wires at the top right, near the ALT and clock (delete clock in my case) and pulled the BULB housing and wire out on that side, I could then get in to pull the big round wiring plug from the circuit board. It was then free and I could take it inside and lay it on my dining table..much to my wifes delight..and swap the circuit board out! LOL
Getting it back in was easier than removal, now I knew all the steps. Lining up the radio knob posts was tricky by myself, but I managed it OK in the end.
Buttoned everything up, tightened the steering column, replaced the battery lead, fired up and went for a drive..All working! YAY! I now know how much gas I have..Or do I? Since as ALL people that have replacement fuel senders it maxes out at half full! Still light years ahead of NOTHING! ;)