Our wireless and direct wire tachometer systems work on a very simple principle. Two or four magnets (depending on the tachometer product) are attached to an engine’s drive pulley, harmonic balancer, or motor shaft. Then a ferrite transducer (the tachometer sensor) attached to a bracket is placed in the path of the magnet rotation. Pulses are produced when the magnet passes by the sensor, and these are transmitted via the Rf Transmitter or the direct wire cable to the tachometer gauge. If you have access to your engine’s drive pulley, harmonic balancer, or motor shaft for magnet attachment, then our tachometer products should work. An example of what would not work is motorcycle engines (no access to the engine’s drive pulley or motor shaft).