Manual trans speedo gears

[mz0dxc]

Does anyone know what color speedo driven gear that I should use with a 3:73 axle ratio. 4 speed manual BW T-10 trans. 68 Corvette. Has a gear in it now that is for a 3:08 axle.

 

[Hib Halverson]

Gotta have the tire size to do much with this question.

 

[mz0dxc]

The car has P225R15 Comp TA's on it right now but the original tires were H70 x 15 Bias belted