Oversized tires and gear swaps throw off your classic-body Ram's speedometer and shift feel. The Flashcal calibration tool plugs into the OBDII port so you can dial everything back in without touching the factory tune.

Superchips 3545-S2 Calibration Features:

• Corrects the speedometer for tire upgrades from 25 in. to 40 in. and for gear or axle ratio changes.
• Idle up function and TPMS options.
• Reads and clears diagnostic trouble codes.
• Digital battery voltage display with real-time data logging and monitoring.
• Upgradeable to Flashpaq tuning.