[Gregski]

ok so the Tachometer has a square butt, so why can't we just cut a square hole in our non tach housings and call it good?

Great question, and it's not like the Greg hasn't thought of it, he's been itching to put his dremel to good use, LOL

It seems like someone at GM was tasked with making these cluster not interchengeable and has succeeded, you see we would also have to cut the printer circuit board and that's where things get a bit hairy since the Tach would go where the large Fuel Gauge lives

here are the backs cloaked with their respected circuit boards for comparison

so put those propane torches down and slowly back away folks... jk