Through an "auto-stop" position, General Motors is using the tachometer to communicate whether the engine is on or off in cars with fuel-saving stop-start technology, said Kurt Tesnow, technical ...

Installing a tachometer (rev counter) on a Moto Guzzi Jackal motorcycle. Get ad-free access for just $10/year. Join today! Log In; Become A Member; ... When both speedo & tach are on, then go around ...