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UTV Water Temp Gauge Installation

Water Temperature and Voltmeter Gauges installed in Polaris RZR
Water Temperature and Voltmeter Gauges installed in Polaris RZR

My Polaris RZR seems to run pretty hot in the dunes.  I have not seen the high temperature warning light yet, but the fan seems to run a lot. I like to know how things are looking before there is a problem, so it was time to add a coolant temperature gauge.

Here are the parts I ordered:

Gauge: Summit Racing - SUM-G2984:

Summit Racing Water Temp Gauge - Polaris RZR

I am typically not a big fan of digital gauges, but I had already decided on digital for my voltmeter, so I figured it would look best to be consistent.

Sending Unit: Summit Racing - CYB-SENSS6E:

Polaris RZR Water Termperature Sending Unit - Electrical

Polaris RZR thermostat housing with sending unit hole drilled and tapped:

Polaris RZR thermostat housing with sending unit hole drilled and tapped also sells a whole water temperature gauge kit for the Polaris RZR that includes gauge, sending unit and thermostat housing.  If I didn't already have the gauge and sending unit from Summit Racing, I would have just bought everything from them.


To install a water temperature gauge in your UTV, you will need to get the sending unit probe to touch coolant somewhere in the cooling system.  There are two ways to to this.  The first is to cut one of the rubber cooling lines and splice in a coupler that has a port for the sending unit.  The second is to drill and tap a hole into the thermostat housing.  I chose the thermostat housing route because I think it is the cleanest solution.

I am not that fond of drilling into factory parts so I searched for another option.  That is where I found They sell a thermostat housing that has already been drilled and tapped for a 1/8 in. x 27 NPT sending unit. Seemed like a great solution so I went that route.

Polaris RZR Thermostat is behind the passenger seat.
The thermostat is behind the passenger seat just above the oil dipstick. Remove the factory thermostat (2 - 10mm bolts).

thermostat for Polaris RZR
New thermostat with temperature sender on the left and the factory thermostat on the right.

Install the new thermostat housing.  No gasket is used, but make sure the mounting surface is clean of debris. Once the thermostat housing has been swapped, install the sending unit.

Now it is time to connect the wiring up for the gauge.  Black wire goes to chassis ground.  Red goes to 12V (ignition hot), purple is 12V when your lights are on (dimmer) and blue comes from the sending unit.

On the RZR, there is a orange wire with a butt connector that is used for a winch. This wire is hot only when the key is on (ignition hot).  I connected the red wire from the gauge to this orange wire.

For the purple dimmer wire, I spliced into the green wire that goes to the factory headlight switch. This wire is hot only when the lights are on.

Then run a wire from the gauge on the dash back to the sending unit.

Redline Water Wetter
Top off the radiator with distilled water.  I added one-half a bottle of Redline Water Wetter while I was at it.


Water Temperature and Voltmeter Gauges installed in Polaris RZR
Finished product


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