Our friend, Mikey Skylar, recently bought himself a diesel car which he converted to veggie oil. He found that he wanted a better way to know when to switch his diesel tank to a the vegetable oil tank. You do this because the veggie oil must be warmed up before it can efficiently run the engine.
Being the builder he is, Mikey made a device called The Greasy Mon that tells him when his veggie oil has warmed up enough. You can either download instructions on how to build your own, or he is now selling these devices to other people who may want them for $100.
There are three thermistors which measure temperature changes based on resistance. Each of the thermistor sensors has four LEDs associated with it which the driver can see illuminate as the temperature increases. Each LED that turns on indicates that the grease has increased by 20 deg. fahrenheit in temperature. The temperature range is from 65F - 135F. Due to the sensors being placed on the outside of the fuel hoses the sensor range peaks rather low to allow for the insulation provided by the fuel hose.
Check out the video here:
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