I have a 85 z-28 and the three middle gauges dont do anything!(water temp, battery, and gas gauge) I know they are pluged in but they arent working! Think i need anew gauges?

 

I also am going to try to put the 140-145 mph speedo in will that work with the old gauge cluster or do i need the whole thing from a Iroc?

 

sounds like the same problem i am haveing only my tach don't work either it had a ten amp fuse and it keeps blowing out so i think its a short to ground somewhere problem is when i get behind the dash all the wires look healthy (none are twisted together) and I didn't see any wires just hanging loose if you find out please send me an email also to let me knowand I would do the same