98 camaroz28
#1
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I have a rebuilt, retuned, upgraded 4l60e and my speedometer is not right I have hptuners and I have done what I am supposed to do, I had to override the system to enter the correct info and still isn't right. I noticed that when transmission is in park and I rev the motor the speedometer moves even on my hp scanner. I read somewhere that the alternator can effect it somehow. any thoughts???