anyone have an idea of which speedo gears to use.i have a turbo350 4.86 gears and 28' tire and the speedometer reads about 85 when im cruzing with traffic in a 35zone. i think im going to go to a electronic speedometer if i cant get it closer.

 

Screw what you have now, just throw them out, get rid of them. Replace them with a 10 tooth drive gear (red or purple) and a 35 tooth driven gear (orange). That should put you right on the money, assuming the info of your rear gears and tire size is accurate.