I'm not sure about a TW20 but the sender for the low pressure switch on aTW35 is at the upper right edge of the transmission housing. The lite should come on when the wire is shorted to ground. If there is no resistance reading from the sender to ground with the engine off, the sender is bad. If there is no voltage to the sender the wiring or the bulb may be bad.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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