Not sure what your talking about? I have to change some resistors to make the stock 145mph gauge work in a 120mph cluster?
I have a 145 gauge w / broken needle. I also have an extra 125mph speedo. Have you driven by a photo radar to see if the converted 145mph is dead on?
1 to 2 mph is impressive. I will think about it. Have a couple other easier options brewing if they dont work I am game.