https://docs.emtronaustralia.com.au/engine-management/config/channels/turbo-speed/index.htmlTurbo Speed is available on Channels DI 1- 8 on KV Series and DI1-4 on SL Series. The units are RPM Tip: See Speed Inputs for information on sensor setup. Turbo Speed Calculation Turbo Speed(RPM) = Frequency x Scaler x 10 Example: 2351 Hz, Scaler = 2.56 Turbo Speed = (2351 Hz x 2.56) x 10 = 60180 RPMHugoen-us