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If it's anything like my 77, and I believe it is. There are 5 bulbs lighting up your tach.
So it sounds like at least 2 are out.
Best way?
Sorry no time to type all directions. Basically, remove left hand dash assembly. Total PITA.
Sorry no shortcuts. However you either oughta modify the lamp holders so they don't 1) fall out, 2) fall in, 3) release lamps.....
You can either get the 2 lead type lamp holders or put in strip lighting (which I did).
I would also recommend adding connectors for both the left and right side of the dash components.... and lengthening the leads. It will make future repairs much easier.
Also --- and it really makes a difference-- just remove the steering column before attempting the dash removal. It's easy and will make the task much easier and less unpleasant .....and you there will less likelihood of damaging the old fiberglass parts.
ANYWAY - search the forum for "dash lights" or "dash lamps".... .lotsa posts by a lot of creative folks.
Sorry no shortcuts. However you either oughta modify the lamp holders so they don't 1) fall out, 2) fall in, 3) release lamps.....
You can either get the 2 lead type lamp holders or put in strip lighting (which I did).
I would also recommend adding connectors for both the left and right side of the dash components.... and lengthening the leads. It will make future repairs much easier.
Also --- and it really makes a difference-- just remove the steering column before attempting the dash removal. It's easy and will make the task much easier and less unpleasant .....and you there will less likelihood of damaging the old fiberglass parts.
ANYWAY - search the forum for "dash lights" or "dash lamps".... .lotsa posts by a lot of creative folks.