Rev counter and speedo not working... any advice?

[gturner008]

Having just bought a 1967 912 - I begin the journey of fixing it up. Its not been driven properly for about 10 years.

The first things I notice are the rev counter and speedo don't work. Any obvious things that might fix or to look for? I'm planning on getting the car up on a lift on the weekend to have a look. I'm guessing the speedo is a cable from the gearbox to dial? Not sure about the rev counter. Electric from sensor in gearbox to rev counter?

Many thanks

Gary

[neilbardsley]

Having just bought a 1967 912 - I begin the journey of fixing it up. Its not been driven properly for about 10 years.

The first things I notice are the rev counter and speedo don't work. Any obvious things that might fix or to look for? I'm planning on getting the car up on a lift on the weekend to have a look. I'm guessing the speedo is a cable from the gearbox to dial? Not sure about the rev counter. Electric from sensor in gearbox to rev counter?

Many thanks

Gary

"Electric from sensor in gearbox to rev counter"

I think it's a electric cable to the coil that measures frequency but I stand to be corrected. The first step I would do if put you digital rev counter onto the back of the RPM counter in the dash. That way you will know if you are getting a signal. Why you are there you can check to see if the speedo cable is connected.

[SeanP]

Rev counter is triggered from the coil. Three wire on the back of the tacho 12v 0v and the trigger cable from the coil, don’t have a wiring diagram to hand. (You can find one on the web).

Speedo is driven from the gearbox. Cable siezed and snapped would be the obvious answer.

Hope that helps

Sean

[gturner008]

Great advice. Very much appreciated. I’m going to have a look at this tomorrow. Best, Gary

[gturner008]

For the life of me I can’t see where the speedo cable connects to the gearbox. Any clues?

[Lightweight_911]

The speedo drive gear is on the right side of the gearbox - when viewed from the rear of the car (just above the mounting crossmember) - close to where the gearshift rod attaches:

[gturner008]

Thanks Andy. I found it yesterday. The bit that spins around pushes into the housing, meaning it does not engage with the cable. I’ve pulled it outwards with pliers, and thing it pops back in. I guess I have to buy a new piece?