1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 313Get this manual
ELECTRICAL Fuel Sender Fuel Sender Operation and Sender Testing
The fuel gauge is operated through voltage signal at the fuel tank sending unitThe sending unit resistance changes with the height of the float in the senderTo check for proper sending unit operation connect an ohmmeter to the wires as shown