I'm trying everything I can to figure out why the speedometer and tachometer are not working on my 1985 (early) Porsche 944.
I can start the car and the MPG area on the tachometer works as I step on the accelerator. The first gauge also appears to be working (fuel, temp, etc). When I took out the gauges, I can shake the speedometer/tachometer and needles move freely. They just don't move when I press on the accelerator.
I already replaced speed/reference sensors and cleaned (most) grounds I could find.
I took apart the console to see what is going on there and found these wires not connected.
Could any of these wires be related to speedometer/tachometer not working?
What/where else should I be checking? Could the speedometer/tachometer be bad? Are they connected in a way in which if one does not work, the other stops working? Would a bad O2 sensor prevent the speedometer/tachometer moving?
I also have this relay sitting deep in dash, apparently not connected to anything. Anyone know what it could be for?
