Hey, like 4 years later - sorry. Do you have said wiring diagram handy? I'm trying to convert my senders to N2K and cannot for the life of me figure out if these are voltage-based or resistance based tank level sensors. Not to mention I don't know the values for high and low as it is - I've tried many guesses so far.
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'05 Rinker 360 Fiesta Vee
https://www.maretron.com/products/tankMonitoring.php
PC BYC, Holland, MI