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Hi Alex,
That last photo with the diodes and resistors looks very ugly with the
start of some crispy crittering.
Do you get get P0500 or P0535 DTC codes?
If the last digit of your ODO is red, then it is a replacement Speedo.
From my adventure with a 1993 fuel gauge I suggest that you focus on the
flex card tracks from:
Speedo head "S-" to connector A14 pins 3 and 4
Pin 4 is ref ground 31/67
Pin 3 has a unknown series component and just noted as "-" in the info
Speedo head "S+" to connector A14 pin 5
Pin 5 is to 7/33 speedo pickup
Connector A14 is at the top left as you look at the back of the instrument cluster. Pin 4 Black wire Pin 5 Green/White wire
Check especially for tracks that use a through hole and continue on the back side of the flex card and come back via another through hole connection.
In the 1993 flex card there is a dotted line to help you know where to tack a jumper. There's no way you can re-flow the through hole joint from one side
with that flex card.
That joint was haunted since it would work and quit on a timetable only known to famous prankster "Murphy".
In addition I found a loose connection at the fuel sensor connector
I used a little smear of dielectric silicone on the instrument cluster connectors, but wonder if a light smear of Penetrox-A would be better?
Take photos of those tracks from Speedo to A14
Good luck, Bill
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