1977 Evinrude 75hp Tilt/Trim sending unit…

ryanp1227

Petty Officer 3rd Class
Joined
Apr 17, 2022
Messages
78
Since it is there already, I want it working correctly. As of now, the gauge will jump around a bit when activated but generally needle pegs to the UP position and stays there when power is cut to the gauge. When power is restored, the needle goes in further past up til it can not go any further…rinse repeat.

Ive looked at diagrams on here and what ive found are pretty accurate until the sending unit. All show two wires from it. Mine has 1. It is part #172574, one wire seems to be how it goes.

Is there a way to calibrate this unit, or would we assume it is toast? Again, dont really care for the gauge but I have it so it might as well work if I can fix it. Thank you
 
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