Patent ID: 6961667

Claim:
A tachometer system for a motor vehicle having an engine selected from a plurality of engines having unique maximum rated engine RPMS, the system comprising: an RPM data signal and scale correction data; a microcontroller receiving said RPM data signal and said scale correction data and generating a scaled tachometer signal therefrom in accordance with a computer program stored in a memory; a gauge drive circuit receiving said scaled tachometer signal from said microcontroller; and a tachometer gauge having a pointer driven by said gauge driver circuit, wherein said computer program calculates said scaled tachometer signal according to a first scaling constant while said RPM data signal represents less than a predetermined RPM, and calculates said scaled tachometer signal according to a second scaling constant while said RPM data signal represents greater than said predetermined RPM, said second scaling constant being selected from a set of predetermined scaling constants according to said scale correction data.