I've never seen one w an RPM rating....but all they are is a transistor switch which I would think could switch faster than the engine ever needed it to....I've never heard of anyone complain that they seem to have an RPM limit.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
