1995 3000GT: Defi Oil Pressure And Temperature Sensors Installation

• Why Do I Want To Do This?

  • There is no stock oil temperature gauge.
  • The scale on the stock oil pressure gauge is almost worthless.
  • Especially if you attend track events, you probably want to keep an eye on your oil temperature as an indicator of engine health and the efficiency of your cooling system.
  • Knowing your actual oil pressure, especially at warm idle can let you know if your oil pump is operating properly and can give you an indication of whether you're using the correct viscosity oil for your climate/conditions.




• How Long Will It Take Me To Do This?

  • Plan for an extra hour when you're going to change your oil. Probably 2 hours total, if taken at a leisurely pace.




• Anything I Should Do Prior To Attempting This Procedure?

  • Jack up and properly support the front end of the car.




• What Mitsubishi Parts Will I Need?

  • None




• What Other Parts Will I Need?

  • Defi Oil Temperature Sensor
  • Defi Oil Pressure Sensor
  • 3/8" NPT to 1/8" NPT Bushing
  • 3/8" NPT Plug
  • M20 x 1.5 Oil Filter Sandwich Plate with 3/8" NPT connections
  • Teflon Tape




• Where Can I Get the Stuff To Do This?

  	Part	Company/Contact	Part Number
  	Defi Oil Temperature Sensor	MVP Motorsports	Defi LinkII or BF Series Oil Temp Gauge
  	Defi Oil Pressure Sensor	MVP Motorsports	Defi LinkII or BF Series Oil Pressure Gauge
  	3/8" NPT to 1/8" NPT Bushing	McMaster-Carr or any Hardware or Auto Parts Store	4429K471
  	3/8" NPT Plug	McMaster-Carr or any Hardware or Auto Parts Store	9171K48
  	Oil Filter Sandwich Plate	Racer Parts Wholesale	PER-186
  	Teflon Tape	Home Depot or any Hardware or Auto Parts Store	N/A





• What Tools May/Will I Need?

  • Oil Filter Wrench [optional]
  • 11/16" Wrench
  • 17mm Wrench
  • 14mm Wrench
  • Pliers or Robo-Grips or a really big socket
  • Drill Bit (3/8"?)

The Procedure

	Drill Holes In Sandwich Plate
	The Sandwich Plate is designed to turn the two threaded holes into an in/out pair so that you can attach an oil cooler or remote filter. My goal was to use this as a pass-through device where I could mount my sensors, so I wanted the oil to flow vertically through the plate. Thus I drilled six 3/8" holes in the plate as shown in the picture. The aluminum plate is very soft, so drilling was easy. I also drilled and tapped a 1/8" NPT hole in the side of the sandwich plate to mount the temperature sensor. Again, drilling and tapping was very easy with the soft aluminum.
	Assemble the Sandwich Plate and Sensors
	Here's everything assembled with appropriate teflon tape to ensure good connections. I figure it's ok for the pressure sensor (top) to be in the recessed area of the plate, because pressure measurements don't need to be made directly in the flow of oil. I chose to mount the temperature sensor in the side of the plate (rather in the other 3/8" NPT hole) so that it would be more directly in the flow of oil. This ensures that I will get an accurate temperature reading.
	Remove Stock Oil Filter
	The stock oil filter mounting location - obviously with the filter removed.
	Mount the Plate/Sensor Assembly
	Here's the sandwich plate assembly attached to the oil filter mount. The plate itself just slides on and then is anchored in place by the threaded bushing-like whatchamakallit (technical term) that screws into the stock oil filter mount threads. Don't forget to put the smaller of the two O-rings on the upper side of the sandwich plate, as this is what makes the seal between the plate and the filter mount. Make sure you tighen down the plate securely or you'll be leaking oil.
	Reinstall Oil Filter
	Everything put back together. The filter is still doing its job and the sensors get to do their thing, too. It's also completely reversible if you ever need to remove the sensors/plate. I ran the sensor wires up along the driver's side of the radiator and then followed the A/C pipe to the grommet in the firewall near the brake master cylinder.