Gen II Gauge issue....

[VRaptor SpeedWorks, LLC]

Hoping someone can help me out here. Just installed the Gen II gauges in a finished GTM and had everything working.. and now the tach does not work..

I just verified that it is the tach that is the issue by taking one of the old autometer tachs and wiring it up and verifying that it works.....so the power, ground and signal wiring is all good....but the Gen II tach does not work. Are these Speedhut gauges? I have a call into FFR, but have not heard back from them and need to get this car finished and out of the shop. Hoping I can just order a new tach online, but not sure of these are Speedhut or some other brand?



168998

[Erik W. Treves]

That looks like a speedhut gauge to me. having said that did you calibrate to the PPS that you need for your installation? default is like 4 PPS and would make it seem like it wasn't working. where are you picking up the rpm signal from?

[Ajzride]

I would call speedhut, they will be much more responsive than FFR. They will be able to help you determine if it is their gauge, and if so how to program it.

[VRaptor SpeedWorks, LLC]

Yes, already calibrated the tach and it was working fine for 3 days. I even went back into the calibration and re-calibrated it and it still doesn't do anything......the needle doesn't move at all no matter the RPMs.....just sits there on zero. When you go to calibrate it, it the needle does move thru the calibration settings like it should and seems to accept the proper calibration, but no needle movement with the engine running. I have it hooked into the tach output from the ECU. Again.....it was calibrated and working perfectly for 3 days and just suddenly stopped working and I did verify that I still have a tach output from the ECU by hot-wiring a different tach to the same gauge-cluster connector that is wired to the car wiring......so all of the wiring is verified and the fact that the tach will still go thru the calibration process shows that all of the wiring to the non-working tach is good.

[Erik W. Treves]

ok - figured you had already done that - but asked anyway - sounds like it just failed. Speed hut should be able to fix you up.

[VRaptor SpeedWorks, LLC]

Well, I feel pretty stupid. For some reason, I thought the pull-up resistors were only needed with the Autometer gauges.....so I didn't install any. Called Speedhut and they asked if I had the pull-up resistors installed....nope. Got them installed and the tach is back to working fine. I guess I'm not understanding how the tach worked for 3 days before it decided that it needed the resistors....but it's back to working now.

[Erik W. Treves]

Lol - yeah I am surprised that it worked at all or ever if you were going off the ECU. I typically run off one off one of the coils.... anyway - gotta love the simple fix :) and thanks for sharing that we are all human....i can only imaging the "internal conversation" that transpired ...lol!