Timm Posted April 9, 2013 Report Share Posted April 9, 2013 Hey guys, the Cutlass is running great! Needs a new top and other odds and ends still, but that's another story. My problem here is I have no tachometer reading! Just sits at zero the entire time. I've tried 3 different clusters. All the same story. The needle does move slightly upward so it's pointing DIRECTLY at zero when turned on, but that's it. HP Tuners registers the RPM signal. The cluster connector seems to be okay. I've attached the wiring diagrams for the gauge cluster. I can test for voltage or resistance at the connector, but have no idea what I should be looking for! I'm guessing I'm going to have to crack open the C100 connector and make sure it's all there. The engine wiring harness is from a 99 Lumina LTZ if that matters at all. Thanks in advance for any help, it's driving me crazy not having a tach!!! instrument-cluster-2-of-2.pdf -Tim instrument-cluster-1-of-2.pdf Quote Link to comment Share on other sites More sharing options...
White93z34 Posted April 9, 2013 Report Share Posted April 9, 2013 what year car what year wiring harness? Quote Link to comment Share on other sites More sharing options...
Timm Posted April 9, 2013 Author Report Share Posted April 9, 2013 what year car what year wiring harness? Car = 95 LQ1 Vert Wiring Harness / PCM = 99 Lumina LTZ Quote Link to comment Share on other sites More sharing options...
Timm Posted April 10, 2013 Author Report Share Posted April 10, 2013 (edited) Now that I think of it, I never plugged in some big black module box under the drivers side of the dash. It's the one that goes just to the right of the e-brake mechanism. Any idea on what that controls? I've got 3 connectors dangling there. EDIT-------------- Nevermind, that's apparently the DERM I'm thinking of... Does the DERM use 3 connectors?? EDIT AGAIN!!!!-------------- Just Google Image searched for DERM W-Body... Got a lot of nasty dermatologist skin diseases and warts and burns and NASTY. -can't unsee- :-/ HERE'S THE WIRES IN QUESTION: And if it matters at all, here's the engine codes: [] P1351 - Ignition Coil Control Circuit High Voltage (SES) (Pending) (Old) (History) (Current) (Immature) [] P1361 - Ignition Coil Control Circuit Low Voltage (SES) (Pending) (Old) (History) (Current) (Immature) [] P1362 - IC Cylinder 2 Not Toggling After Enable (SES) (Pending) (Old) (History) (Current) (Immature) [] P1663 - Oil Life Lamp Control Circuit (History) (Immature) [] P1671 - Driver 4 Line 1 (History) (Immature) [] P1672 - Low Engine Oil Level Lamp Control Circuit (History) (Immature) Continuous Tests Misfire: Complete Fuel System: Complete Comprehensive Component: Complete Edited April 11, 2013 by Timm Quote Link to comment Share on other sites More sharing options...
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