anscheinend ist die Idee nicht so neu..

Digital degree wheel for testing ignition timing
Document Type and Number: United States Patent 6111413
Abstract: A digital degree wheel is provided including an engine sensor mounted to at least one of a camshaft, distributor and crankshaft of a vehicle for generating an activation signal after the detection of the rotation thereof. An ignition sensor connected to an ignition of the vehicle for generating a deactivation signal upon the detection of the advancing of the ignition of the vehicle. A display connected to the ignition sensor and the engine sensor for displaying a plurality of numeric digits representative of a timer, which is adapted to begin upon the receipt of the activation signal and further cease upon the receipt of the deactivation signal for setting and checking the ignition and valve timing of an engine of the vehicle.

Ein Ingenieur der nicht säuft, ist wie ein Motor der nicht läuft!