1999 Polaris SLH, SLTH, SLX, SLTX, PRO785 Factory Service Manual, Page 284Get this manual
HULUDECK, STEERING AND CONTROLS Speedometer Speedometer Operation and Inspection
The speedometer is operated by water pressureThe pressure is supplied to the back of the speedometer through hose connected to fitting located inside the jet pump intake grate area1If the speedometer becomes inoperative first check hose for kinks or restrictionsCheck to see that it is connected properly to fitting and to back of speedometerThe fitting must be aligned with the pump intake grate to read accuratelyOccasionally foreign debris such as grass or weeds will lodge in the fitting or lineTo clear hose and fitting, disconnect hose from speedometer and apply low pressure air to hoseTo test speedometer unit, connect Mity VacHA to the fitting on the speedometerApply pressure and compare the reading to the table belowRe-connect line and test for proper operation