Re: Aftermarket temp gauge for 1986 Force 125hp
It is not a sealed high pressure system, but there is pressure or it would not circulate.<br /><br />Small fitting screws into pipe plug on top of engine, just above the thermostat housing. plastic tube runs to the gauge.<br /><br />Pressures will vary but mine are:<br />2-4 psi at idle<br />8-10 at mid rpm<br />13-15 at full throttle<br /><br />These readings are with a new impeller.<br />After a couple years, the pressures start to drop as the impeller ages.<br /><br />If you plug the water intakes with debris or weeds, the water pressure drops immediately. Same if your impeller fails.