benzyne

Rennlisters,

Does have advice on trouble shooting the tach signal on a 1992 964 Turbo? The actual Tach works ... I've tried two tachs on my car and a friends car ... so there's something missing from the signal that car should be giving.

I've heard the black/purple wire provides the signal but I don't know where it goes to after the tach.

Cheers,

Ben

Miles965uk

Im no expert but the EZ69 provides the signal.

It goes to the box underneath the left seat into a control box.

From there it goes to the tach.

You have to check it with a scope to see if its giving a signal... could be the EZ

Please post your findings, im having trouble myself after converting it to EFI- it was working fine and now has stopped.

Look at the electrical diagrams for tach from teh EZ and follow.

Francisco Martinez

Hopefully this can help you start the troubleshooting,

OBC Pin #
1 Pin #4 of clock (+12V power) red
2 Stock tach harness pin #2 (ground) and OBC stalk pin #1 brown
3 Stock tach harness pin #3 (turn signal LH) black/white
4 Stock tach harness pin #4 (high beam) white/black
5 Stock tach harness pin #5 (turn signal RH) black/green
6 Stock tach harness pin #1 (lights) gray/blue
7 Not used -
8 Temp sensor pin #1 blue/green
9 Central indicator (informer) pin #7 beige connector (fuel signal) brown/black
10 Temp sensor pin #2 brown/green
11 Not used -
12 Pin #2 of speedometer (speed signal) white/red
13 Pin #4 of connector behind LH kick panel (door armed signal) green/white
14 Stock tach harness pin #7 (tach signal) orange
15 Stock tach harness pin #2 (ground) brown
16 Not used -
17 Not used -
18 Not used -
19 Not used -
20 Not used -
21 Stock tach harness pin #6 (tach signal) black/violet
22 Pin #6 harness under seat from DME (TI signal) white/green
23 OBC stalk pin #2 white
24 OBC stalk pin #3 green
25 OBC stalk pin #4 blue
26 OBC stalk pin #5 gray

benzyne

Francisco, that is very helpful. Thank you. I will take a look at it sometime this week and will report back.