Range 0 - 100%. Gauge displays percent of fuel left in the tank. Designed to ISSPRO type sensor RA-XXXX Series 240 ohm - 33 ohm. Pre-calibrated for the ISSPRO Tank Sensor RA92000 Series. "Low Fuel Warning" will flash when the percentage reaches 20%. Red, Blue, or Green LED display. Mounts in a standard 2-1/16" hole. Limited lifetime manufacturer's warranty. Made in the USA.