wiring sounds right ... any - + markings at the wire points on the guage?
anyway its definatley signal / + / - and the lights + / -
as for sender ; it will depend on the working signal the guage requires.
im pretty sure the work off resistance. + pressure should reduce the resistance letting through a greater voltage creating a higher guage reading.
so in theory 0hms resistance should = max pressure and reverse signal (prob bout 100ohm) would be like 0 pressure.
i think itll be a case of see what a 7m is std then hook the guage up and see if it gives that reading???
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