1995-1997 Kawasaki 750ZXi-900ZXi Jet Ski Repair Manual., Page 192Get this manual
13-38 ELECTRICAL SYSTEM
Speedometer Sensor Inspection
The waterwheel at the rear of the hull rotates in proportion to almost its hu(f speed, so the change of rotation is made to be alternated into pulse by electric circuit This is why some magnets are buried into it The waterwheel is made to be magneto The speedometer can read out its pulse and indicate the presetted speed Tur the ignition switch ON Measur the input voltage of speed sensor RW, BLWapprox 12 voltsSpecial ToolHand Tesler: 57001-1394 the voltage is less than about 12 volts, the battery, the main harness or the main switch are in malfunctionHand Tester