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Calibration Information

Follow the instructions below to calibrate your Hot Oil Sensor. It's simple!

How To Calibrate

Please note that we calibrate the Indicator Wire to ground against the screw at approximately 230 degrees (F). The initial warning will then begin as a "Flicker" at approimately 225 degrees (F). Since we often meet customers with Hot Oil Sensors from the 1970's, 80's and 90's there may be a time when you wish to confirm calibration. Here's how:

1. Bring to a vigorous boil, 2" of water.*
2. Place the Hot Oil Sensor in the boiling water. The copper Indicator Wire should be roughly in the 6:00 position prior to the boiling water and within 15 seconds of entering the boiling water it will be roughly 3/16" from grouding out against the screwhead.


3. Adjust to meet your needs by loosening the lock nuts.
4. Twist the set-screw assembly until it touches the copper wire at your desired temperature. (We continue to recommend 230-235 degrees F.)
4.. Tighten the Set-Screw.

NOTE: Please perform the tests above in a closed environment. There will be hot surfaces and the Hot Oil Sensor will be hot to the touch as well.

When the correct calibration has been reached simply tighten the set screw, apply a drop of fast drying, high quality glue to adhere the set screw assembly to the brass tube. This will prevent it from moving and should last for many more years.

And as a final word about the calibration temperatures, we have operated air-cooled VW's for decades. The dash light illuminates infrequently and generally only on the freeway when we push our engines abnormally hard, on unusually hot days at high speeds, or when we are pulling long hills with extra weight. If the light flickers simply slow your speed. If the light goes out then your temperature has dropped. If the light goes solid, or continues to flicker, pull to a safe location to check that you haven't lost oil pressure.

*Water will boil at different temperatures, at different elevations. Should you be at a higher elevation, where you have concerns about accuracy, we suggest including a thermometer to compare against. Candy thermometers work well and can be found at many large retailers for around $10.