For the application I have in mind, these are excellent gauges. 500° CHT gauges are hard to find. These read in both Celsius and Fahrenheit. A true measure of the health of any air-cooled motor is head temperature. I'm surprised these aren't standard equipment on motorcycles as they are on aircraft. The needles will auto level until a sender is attached. These gauges read accurately. If you ride an airhead, do it a favor and install these!