TCI Speedometer Driven Gear GM 39 Tooth Brown Hans Device Padding There are two easy to

There are two easy to read rotary dials that let you set the launch rpm in 100 rpm increments

This assists in setting up the proper rotor phasing for accurate timing and spark control

nitrous oxide and extreme compression ratio engines

or mirror brackets

TCI Speedometer Driven Gear GM 39 Tooth Brown Hans Device Padding There are two easy toGM 200C 375B TH425 475 700R4 39 Tooth Speedo Drive Gear.. 39 Tooth GM Speedo Drive Gear. Speedometer gears include both the drive gear and the driven gear. The drive gear refers to the gear that is on a transmissions output shaft. The driven gear is located in a removable housing, usually in the tailhousing, of transmissions. Be aware that some transmissions will have different driven gear housings depending on the tooth count of the driven gear. TCI