the 3 tabs were easy but those are just on the other gauges. The speedo chrome is crimped all the way around and has no tabs. they did this so tampering with the odomoter was not easy. I managed to get the chrome ring and glass off then the unit can be serviced. I did put a few small ham fisted dings in it though. The chrome is not all there anyway. I am gonna switch to white gauges after a while I think or if I run into a deal on a factory tach for the round gauges I might go that way.