In Reply to: Erratic Tach posted by MC on September 11, 1999 at 20:52:42:
: Fellow '02 pilots...
: I've started to notice on shifting that my tach is showing wild swings and it sure isn't reflecting the actual engine rpm. What is going on? Do I have a dried out cable that is developing a twist under load that is then released on shifting, thereby causing these wild swings up to the redline? Anybody experienced such a phenomenon? And yes, I REALLY am lifting on the gas when I shift and the engine isn't revving that high!
: MC (Atlanta, 73 '02 w/ da Alpina flares)
First, the tach is not cable driven, it is electronic. The only cable driven instrument is the speedo in an 02. You can take the entire gauge cluster out of the car in about 2 minutes. It is held in by a couple knurled knobs, the speedo cable, and has two or three(if Tii) connectors. I would clean all the grounds. There are grounds under the dash board. There are grounds under the hood by the left strut. I would replace all the fuses in the fusebox and clean the terminals in the fuse box. Then check the wires at the distributer and coil to make sure they are tight and not shaking loose at high rpm. Also clean and inspect the connections on the back of the gauge package. This is a good time to take it apart and clean the inside glass, dust the faces, and clean or replace all the dash lights too. What a difference that makes!. Anyway, hopefully, one of these things will clear up the problem. You might try a friends instrument cluster if you think it is in the gauge. All else fails, there is a cluster for sale on e-bay right now.
Hope you get something out of this.