Bought my 04.5 lly with tuning already on it with dsp5.
I was told when changing switch positions you should notice a bump in the tach needle. Is this true?
I do not see any fluctuation of the tach needle.
I did test resistance of the switch positions and it does change. I checked wires from ecm to switch and they seem fine. Im concerned that nothing is working
any help would be appreciated. Thanks.