Knowing the speed of the motor shaft is essential to various EV operations including transmission shifting. Here's a bolt-on accessory that's made to be flexible, easy to install, and provides essential RPM data. This shaft speed rotation sensor kit mounts to the tail shaft of a variety of small shaft motors including Warp 8, Warp 9, Warp 11 and Impulse 9. Then provides the wiring to be directly connected to a multitude of guages both aftermarket and OEM or can be used with your motor controller. Beam up one and fine tune your investment.