My instrument panel never did seem to work right.
the ammeter never seemed to register any movement.
Thank you for the Quick response !!
I will try larger photos.
That might be normal if you never put a large load on the alternator. If the alternator was putting out enough energy to keep the battery charged then the ammeter on the dasy would move very little, if at all.
Even with low battery and I know charging heavily No guage movement.
The oil light never came on ( I added an oil pressure guage years ago).
This is a good thing. I ideal circumstances the oil light only comes on when you first turn the key on. As soon as the motor starts it should build enough pressure to turn the light of.
Even with low oil pressure the oil pressure gauge has shown still no light.
Fuel guage never seemed to read correctly.
Not overly surprising. Clean the grounds, you already replaced the circuit board voltage regulator, last step is to get ohm readings of the sending unit at various float levels.
New grounds, new fuel sending unit. still flaky, this and new speedo actin is what prompted me to look at instrument panel.
Lately speedometer started to pin whenever I went over 70MPH
Sounds like you need to rebuild the speedometer head.
I hope not, But have a suspicion you are correct. This is a new problem. I thought to try the easiest thing first.
So I decided to tear it open and resolve all this.
New speedo cable turns out to be wrong one. ordered 1979 to 1984. Looks like from pics I have seen 1985 or later.
circuit board looked as though it had been repaired......New circuit boards (both)
new voltage limiter (solid state)
My question is:
When assembling new circuit board there is a lug at one end near one of the IP lights.
Is this a ground lug ? no wires were attached to it but there is a connector nearby that looks as though it would fit (doesn't quite reach) but that may be the instrument panel could have been changed.
Pics attached :
Your pictures are too small and of too low of resolution to let me see what you are referring to. Try posting bigger pictures.
If memory serves, there is one large plug that goes to the circuit board by the speedometer and a separate smaller plug for the oil pressure and battery gauges. i do not recall any separate large lug or plug on the 79-87(?) instrument cluster circuit board.