97targa

Will a Cobra guage cluster work on A GT without any mods to either the needles or wiring for the speedo? I have a 97 and a cobra spedometer set-up from a 96. I know I have to get the ones from 96-98 as the 94-95's are diff. but will the speedo be correct for me? I'm most sure they will be interchangeable with the harness, but I don't wanna go screwing things up. My temp guage didn't work so I figured while I'm in there I'll just replace it with a White guage set-up! Also someone told me I can swap out my odometer needles(the unit that records mileage)?? Is there any trick or will it simply unbolt? I haven't taken anything off yet!