While I am still confirming the signal coming out of the speedometer, I took a closer look at the gauge itself.
After removing the gauge from the cluster housing I spotted some discoloration.
This happens to be near a fairly sized electrolytic capacitor.
I already spotted a trace that is potentially broken, so I began cleaning the area with a soft toothbrush. Sadly, even the softest bristles caused the solder mask to flake away. Since it didn't matter any more I switched to 2 jewelers cleaning brushes, one fiberglass and one nylon. Sure enough, the damage to the trace is more visible, but it passes under a resistor and I don't know where it leads.
Removed the resistor, and unfortunately lost it, but thanks to the photos I know what its value was. Anyway, with the resistor out of the way we can see that the trace is definitely broken, and simply passes under where the resistor was.
Now that its confirmed, it has been patched using some thin wire and the resistor replaced with a 10k through-hole that I had. Also attempted to tin the exposed copper traces while I was at it. Admittedly, this will need a little cleanup before I re-seal the board, but it should help at least slow down any more deterioration of that section of traces.
I've already reattached the board to the gauge and put it back into the cluster. I'll be testing it later when the sun is up.
By
Silver ·
Before i go on to mod my Z I want to make sure the basics are all good.
its a 91 J spec auto with 71k miles and so far
Plugs
Oil and filter
Air filter
Cambelts and water pump
Autobox cooler
Pressurised autobox oil flush
Check throttle balance
Next on my list
Coil pack connectors as these are not the best
Brakes ( absolutely awfull ( warped))
PCV valves ( is this a leave it till it goes item or do it now before it goes item)
check tps and timing and base idle set.
Stupid exterior trim with shiny crome showing through ( Paint car colour maybe)
Any other things to do would be appreciated