Much to my surprise ( annoyance , actually ) there's no RPM meter on the Super Z HD . When the engine runs , the hour meter should really be setup to show RPM :-/ So , Ebay to the rescue ;-) White meter shows air temp on top and probe temp ( attached to oil cooler ) below . Black box show RPM ( 5 seconds lag .... ) when running and max RPM used since start-up ( for 2 seconds ) , when engine is switched off . . . How hard would that have been ?