In an automatic. Find out what rear end ratio you have. Go to local GM dealer and get the correct plastic speedo gear for the transmission. Take the speedo cable loose. Remove the retainer clip from the housing. Remove the cover then the gear. Reverse the process. I did it. You can. Unless yours is a manual. Then well, I don't have a clue. 
http://kurtspontiac.homestead.com/DavidJones69GTO.html
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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