I'm in need of the same service, looking forward to a response. When I turn on the instrument lights the gauges go wacky? I'm guessing the board is shorted somewhere?
I don't think the gauges are servicable as they were made by AC Delco unlike the Sterwart Warner gauges.
These gauges were part of the Total Command System. Go to the Super Disc for some history.
There is some good news to this in that usually the actual gauge is okay and the problem is in the wiring, the gauge connections, and black boxes. Unless the needle has broken off the gauge coil, you probably can fix the problem with time and patience. This also means that even if you can locate someone that does restore these gauges, you will not likely actually resolve the problem.
The Total Command wiring schematics are in the files section here.
The other alternative is to redo the helm instrument panels and rewire for the new gauges.
You can change out the gauges for round ones but you will need to make a mounting plate and wire them from the black plugs that now connect the square panel. A word of caution here I believe that in doing so you need to use what they call Murphy style gauges that will trigger your alarms.
Chris I think each gauge may be able to be replaced--but you have to have the same square gauge-- which on my 1973TF --I repowered and placed new gauges.So I have 2 sets of your gauge packs as I removed both from my flybridge and lower helm. My gauges are not damaged--but some of the individual gauges were not working when I removed them--and I do not --remember which ones did not--or even know why they were not working(eg gauge issue or sender/wiring issue). Anyway if you are wanting to rehab yours and wanted/needed other sets to combine I have some. 50$ plus shipping for both.--Al
Thanks, having the wiring checked this week.