Superlift TruSpeed Speedometer Recalibration for 92-02 Jeep Wrangler YJ & TJ with Over Size Tires

When tire height or axle gearing is changed, the speed sensor on '92-' 02 Wranglers sends erroneous information to the Engine Control Module (ECM). Unless remedied, the various control systems will think that the vehicle is traveling at a different rate of speed than it actually is. The reduction in the computer-controlled performance can be significant. The TruSpeed corrects speedometer and odometer readings, engine and powertrain signals, and anti-lock brake control modules. Besides the obvious, these modules affect fuel delivery, engine timing and automatic shift points. Two settings allow off-roaders to run different diameter tires with a flip of a switch. Can be recalibrated infinitely for future tire sizes or ring and pinion gear changes. Simple four wire hookup with complete instructions and adjustment charts.