APEXi Rev/Speed meters are complete multi-functional measuring devices. They're designed to measure and monitor data such as vehicle speed, engine rpm, and elapsed times.* Setting Parameters: tire size, vehicle weight, RPM output, speed output, RPM warning, and speed warning.* Monitoring Parameters: Up to 4 channels displayed in numerical and analog display modes: (RPM, speed, travel distance, Fr/Rr acceleration, Lt/Rt acceleration, and battery voltage)