Instruction Manual
Water Temperature Gauge 
For Product Numbers: MT-DV06, MT-WDV06 
Wire Harness Color Code 
Red: 
12v Constant (un-switched) Source (+) 
Black: 
Vehicle / Engine Ground (-) 
White: 
12v Ignition (switched) Source (+) 
Black: 
Connects to Black Wire on Sensor Harness 
Orange: 
12v Dimmer (switched) Source (+) (optional) 
White: 
Connects to White Wire on Sensor Harness 
1. Disconnect the negative battery cable. 
2. The water temperature sensor unit may be installed 1 of the 2 ways 
listed. The sensor should always be installed before the vehicle 
thermostat or the gauge will not display a reading until the vehicle 
thermostat has been opened. 
  Stock Sensor Location: Use a T-fitting (optional) to T off 
your stock sensor location. This will allow you to keep your 
stock sensor installed, while also allowing you to install an 
aftermarket temperature sensor.  
  Coolant Fluid Port: Locate a coolant fluid port located on 
your engine and remove the port plug. Directly install the 
water temperature sensor to the coolant port. Additional 
adapters may be required if the coolant port is not threaded 
to 1/8 NPT. 
3. Route the temperature sensor wire harness from the back of the 
gauge (slot #2) through the firewall, engine bay and to the sensor. Next, 
couple and secure the sensor wire harness to the temperature sensor. 
  Be sure to use a grommet when routing wires through the 
firewall to protect them from stripping and damage. 
4. Connect the white wire to a positive 12 volt ignition (switched) 
source. It may be connected to the fuse panel, an accessory wire, or any 
positive 12 volt source that turns on and off with the ignition switch of 
the vehicle. 
5. Connect the red wire to a positive 12 volt constant (un-switched) source, 
either directly to the battery or to a fuse panel on the vehicle.  
  If wiring to an un-fused source, install a 3 amp fuse inline within 
20 inches of the sources connection. You may obtain an optional 
“expandable circuit” accessory. This component easily fits into 
your fuse panel and provides an additional fused power wire for 
accessories such as gauges. This is available at 
www.MaxTow.com or a local auto parts store. 
6. The Night Time Dimming feature decreases the brightness of the gauge 
face by 30%. Connect the orange wire to the 12 volt positive headlamp 
source. This allows the mode to be activated when the headlights come on. 
This step is optional and will not affect operation of the gauge if it is 
omitted. NOTE: Do not connect the orange wire to a dimmer wheel. 
This will cause the gauge lighting to flicker. 
. 
7. Connect the black wire from the gauge, to any good (unpainted) ground 
connection. You may also route a wire directly to the negative side of the 
vehicle’s battery.  
8. Reconnect the negative battery cable. 



