I did a little research online and was worried it would need a lot of trimming and fitting. Minimizing your wiring with zip ties helps a lot with fitment. I didn't need to trim it at all and just used some heavy duty double sided tape.My only regret is not putting on another layer of trim paint because i wore down the paint with my hands manipulating it into position. The Isspro (also from Geno's) gauges fit perfectly in the holes. I can't speak for any other brands.