Tachometer issue

[Mr.Maki]

Hi. I need help, a week ago my S2-92 started driving out of the garage and the tachometer suddenly stopped working, everything else works normally. have any of you had the same problem?

[Tractor Dave]

Try giving the dash a light thump just above the cluster.

[Mr.Maki]

I did it but nothing happened. do you know where the signal to the tachometer comes from about the generator or the ignition coil?

[Tractor Dave]

I did it but nothing happened. do you know where the signal to the tachometer comes from about the generator or the ignition coil?

Taken from G28 sensor on the side of the bell housing. Info here.
https://forums.quattroworld.com/s4s6/msgs/20986.phtml

[Tractor Dave]

More likely damp in cluster and poor contact. Has the car been in the garage for long?
Any mouse damage?

[K Simmonds]

Or try hitting it harder.

[newsh]

There are two sets of long connecting pins in the cluster that can need resoldering to the circuit board, I’ve repaired a few.

[K Simmonds]

That'll be the problem then, very good info that John.

[janglos199]

Damn, it was so easy. I had the exact same problem. I went to the workshop with this issue. They claimed that they've replaced the board, ran diagnostics and did something else. They've charged me £200.

[Tractor Dave]

There are two sets of long connecting pins in the cluster that can need resoldering to the circuit board, I’ve repaired a few.

Have you got a pic of the pins John?

[K Simmonds]

I've got a couple of circuit boards knocking about in the house, could take a pic of one latter if John can't help, just having a quick break and a cuppa.

[newsh]

Have you got a pic of the pins John?

They’re the (25 or 30mm?) long pins that connect between the boards, they’re soldered to one board and slide into tiny individual sockets in the other board. The solder joints can go dry and things become intermittent, like the tacho or the speedo. It’s quite obvious if the joint has failed as the pin will wobble. Check the little socket too, use a dab of switch cleaner (caig de-oxit is fab) and, if you have some fine long nose pliers, you can very carefully squeeze the contacts to tighten them up a bit.

[Rikki Kitto]

Love this Forum was jus about to post a thread and found just what I need

[Rikki Kitto]

Mmmm solder looks ok not sure about this part of the board thoughps sorry for the hijack but thought pics might help you too

[K Simmonds]

It's hard to say from looking at the picture but that does look like a broken track, have you got a multimeter to test the circuit with? If your handy with a soldering iron they can be fixed by bridging the damage with fine wire, I'm never very happy with the results of this mind you.