View Full Version : autometer speedometer/odometer calibration
I tried to calibrate my Autometer speedometer/odometer this morning and things did not work out. I held the button, started the car, waited until the arm swept to full then released the button. I the pressed the button again to start the 2 mile drive, and the arm moved to straight up, like it was supposed to. At the end of the 2 mile course I stopped and pressed the button again. Instead of dropping to 0, it hovered around 30 mph while the car was not moving. Then, it slowly dropped to zero as I started to move. I did the entire process again and same result. Something else that I think is off is the counter on the odometer during the calibration. Whenever I would stop during the calibration, the instructions indicate the counter would also drop to zero, but it does not, it continues to count really fast.
Anyone have an idea if I am doing something wrong or where to troubleshoot?
Thanks
JJ
RoadRacer
10-21-2023, 02:08 PM
I'd triple check the wiring (always the case!!), and if you have a tremec TKO600 you may have two sensors, one each side (depends where you bought it if one of them is blanked off). I could only get one side to work reliably.
Lastly, I've also had a speedo that failed, and was sent back for service. They replaced it for cheaper than new.
weendoggy
10-21-2023, 04:27 PM
As mentioned, check all connections and routing first. I've done several of these and never an issue. Very reliable. TKO/TKX use the same 2-wire OSS and the TKO is on the right rear of the transmission. One wire to speedo, one to ground. Easy peasy.
Thank you all for the posts. I checked my wiring and for some reason I attached the grey speed sensor wire to the VSS out slot on the gauge. I believe I need to ground this instead as I think I have a floating ground problem. I do not see where to ground the grey wire mentioned anywhere in the manual, so I assume I put the wire in the VSS out because it was an empty slot. Thinking about it now though, that seems wrong and it should be grounded instead with nothing coming out of the VSS out from the gauge.
(correction: the autometer instructions indicate to ground the speedo sender, so I should have caught it there)
RoadRacer
10-21-2023, 09:24 PM
I remember a grey wire causing me initial problems. Let me see if I can find it in my build thread
RoadRacer
10-21-2023, 09:27 PM
Yes here it is : https://thefactoryfiveforum.com/showthread.php?24163-Roadracer-s-997-build&p=445302&viewfull=1#post445302
James,
Yep. Looks like I went down the same rabbit hole as you and got the same results. I will ground the grey wire as that should correct things.
Thank you for confirming.
JJK
FF33rod
10-22-2023, 01:24 PM
I'd triple check the wiring (always the case!!), and if you have a tremec TKO600 you may have two sensors, one each side (depends where you bought it if one of them is blanked off). I could only get one side to work reliably.
.
James, I believe one side is mechanical (for mechanical speedo) and the other is electric (which is what should be used for the autometer guages that come in the kit)
Steve
RoadRacer
10-22-2023, 03:18 PM
James, I believe one side is mechanical (for mechanical speedo) and the other is electric (which is what should be used for the autometer guages that come in the kit)
Steve
Makes sense.. except my tko came with an adapter that allowed me to wire either side. And I picked the wrong one. Eventually the plastic gear started failing and I swapped sides.