Inside the headlight nacelle, disconnect the rev counter (tachometer) cable.
Has a tachometer on the black outer bezel (non rotating of course).
Clean looking dial with bold numbers and discreetly placed tachometer scale on a tiered internal fixed bezel.
The fan 's tachometer output enables the alarm module to monitor the speed of the fans.
Tachometer generator -- device that supplies power at a frequency proportional to the driven speed which drives the synchronous motors in the indicator.