Ok so I have an 87 formula firebird and pretty much everything on the instrument cluster dash is broke except the RPM gauge. When I bought the car it was broke and It looks like it may of been replaced before. The speedometer only goes up to 85 mph anyways and who wants that in a V-8. So my question is could I want to repace the whole instrument cluster and would I be able to put a speedo in that goes up to 140 mph and would a trans am or camaro dash instrument cluster work? Also what years firebird, camaro, trans am dash cluster work in an 87? Is this a hard project to do? Please help.