Quick question, I changed basic instrument cluster on my 97 Cav, 5spd to a 97 Z-24 with a 4spd auto. It works and the only thing of course is the upshift light is not there and PRD123 don't light up which is fine. My question is the tachometer. At 60mph my tach reads at about 2100-2200 and at 70mph its a hair above 2500, is this whithin the ball park figure where it should be.TIA