This quote from the Efficiency->how it works page on Tesla's site always rings in my head:
I couldn't really accept it as more than talk until a recent speedometer failure in our 2001 Honda Civic. Believe it or not, they actually store the odometer value *inside* the gauge cluster. Even though they have an ECU to centralize this kind of data for the whole car, they continue to maintain all mileage-related state inside the gauge cluster (which means that my cluster swap requires me to check the odometer-invalid box on my title when I sell it). I can only assume that's an artifact of old-school thinking during the change-over from speedometer cables to speed sensors.
Anyway, Tesla's language is beginning to gain note of truth for me
Unlike lesser cars, these systems are not merely a hodge-podge of independent systems arranged pell mell
I couldn't really accept it as more than talk until a recent speedometer failure in our 2001 Honda Civic. Believe it or not, they actually store the odometer value *inside* the gauge cluster. Even though they have an ECU to centralize this kind of data for the whole car, they continue to maintain all mileage-related state inside the gauge cluster (which means that my cluster swap requires me to check the odometer-invalid box on my title when I sell it). I can only assume that's an artifact of old-school thinking during the change-over from speedometer cables to speed sensors.
Anyway, Tesla's language is beginning to gain note of truth for me