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It may need to have the ecm from a manual shift truck. All i can figure is that the ecm is reading shift fault codes and therefore going wacky with the tach signal. Have you plugged in a decent scanner to see why rpm the ecm sees compared to the gauge on the dash?
You may also be able to figure out what connections need to be made to fool the ECU into thinking it's getting a shift signal from an automatic transmission. Then install a rotary switch on the dash to set to whatever gear you're using .
Any other fault codes?
The trans is in no way operating the tach. The tach wire goes straight from the ignitor to the ecm and dash. End of story.
Are you actually turning the engine 3k or the tach is just saying that?
I had a 3rd gen dash, had a factory potentiometer on it. I was able to just adjust to match.As far as open loop, does your tool show o2 data?
I’ve never gotten to the back of the gauge cluster, but if I did, there’s an adjustable potentiometer for the tach? I don’t doubt you, I just want to confirm? Any description of how it looks or location?
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