I have a 85 turbo NYer with the electronic cluster and I want to replace the Message Center with a tach from a 600ES electronic cluster.
I took the cluster apart and unplugged the message center and plugged the tach in where it is marked "tach" on the board. Put the cluster back in the car and the tach LEDs only light up to 2250 RPM and above that it flashes and goes out until the revs drop again. The LEDs over 2250 RPM never light up, regardless of engine RPM.
I have tried it with two separate tach modules, both do the same thing. I looked at the main cluster circuit board and the only thing I found is a 3-conductor ribbon cable that plugs into a connector with 6 pins. The connector is plugged into the three pins that are towards the right side of the car, does that connector have to be moved to make the tach work? I haven't found anything in the FSM about it.
I was hoping that just replacing the message center with the tach module and replacing the bezel would work, is there something else I am missing?
Thanks in advance for any help you can provide,
Warren