I've seen where someone had broke thier speedometer doing this so I am asking what is the best way to do install them? Should I take the gage cluster out entirely? Should I attempt to remove the needles? If so, how do I avoid breaking them? And also, how do I locate the power that goes on when I turn on and off the headlights? Thanks guys.. I have an 85 Iroc 145mph gage.

Dan