How about a ScanGauge instead if your vehicle is OBD capable? The factory trans temp sensor is in the heart of the transmission and very accurate. Added benefit is the other readings you can get as well.
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Ray
Beastie 3: 2002 7.3 EB Cargo: Agile TTB, CCV High Top, Custom Walk Through, Lots of stuff added. www.BlingMyRig.com