When i first received it was suspicious of the quality of the in-dash tach. It just didn't look like a really nice piece. I left my Autometer Sport Comp in place after I installed the in-dash tach last winter, and from what my eyes could tell they both reacted the same. I was just stationary and revving up the engine in park, but it didn't seem lazy or slow compared to the Autometer, so I removed the Autometer. Once spring arrived and I was actually driving the car I was able to confirm that it reads exactly the same as the Autometer at steady speeds.