Is this like an aftermarket ( Autometer) tach or somthing like that? Cause on my Autometer tach you hold the trip in and turn while pressed then press the trip again to show the redline. On mine you have to play with it for a bit to get it at the right RPM marker. Also my car has to be running to do this. But this should be obviouse so I am guessing you dont have a tach like this and I wasted my time here
