TST is what I have been using for years. They have upgraded the systems and offer systems where you can not have to replace the battery in the senders or a system you can replace the battery. Contacting them directly will get all and any questions answered correctly. It is Truck System Technology (TST).
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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