Well, I've been thinking about upgrading my 85 mph speedo to a 87 and up Z28 speedo until I get enough money to do something with some Autometers. My question is, should I just change the speedo or the whole cluster. I've heard some people say do the whole cluster, while others say to do just the speedo. I don't necessarily want to change all my sending units either for all but my tach and speedo. Plus, I looked at a friend of mines 88 Iroc and the yellow and red line on the tach is higher up, and I don't exactly want to pull a no brainer some time and shifter at too many R's. Thanks for all the input.

 

Thought I'd add a few things, its an 86 305 with a 700-R4. Just wanna make sure that the speedo will work and I won't really have to calibrate everything. Thanks again.