Speedo Problem Need Help!
 

I just finished changing out the gear to fix my odometer, the speedo was working prior. When I start up the car the speedo shoots up to 150 and stays there. Any idea what would cause this? It is a VDO gauge from 1983 911sc. Any suggestions would be appreciated.

Thanks,

Gerard

Take it apart again and double check everything

And this must be why 911's look fast, even when still! :)

I suspect you have swapped the sensor wire with another on the back of the gauge.

When I took it apart I made a connection diagram. Kind of hard to mess up that way but just in case. There are ony three wires to connect: power to + ground to - and sensor wire goes beside the ground terminal, I dont't remember the gauge marking off hand. This does leave one connector on the guage with nothing attached to it. The gauge is electronic. Any more suggestions? Does the bentley repair manual cover guage troubleshooting?

/Gerard

From an earlier thread:

Well the the saga continues. I found a trace on the board that was lifted and broken so I ran a jumper. It also looks like I have a blown resistor and this is where I need some help. I need the value of the resistor that is closest to the 12V lead wire on the speedo pcb. The colors are gold / something / something / orange. Does anyone know what this is supposed to be?

Thanks,

/Gerard

Send to Pelican. They have suppliers that can repair it and calibrate it.
Why risk damaging it further?