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Oil Pressure Gauge 87-91 Bronk

95F350XL

Master Junk Tech
So working on fixing my oil pressure gauge, and looking at the diagram, looks like the wire from the pressure sender goes to the gauge then the gauge goes to ground. How come there are 3 pins on the back of the gauge? If I apply power and ground to different pins I can make the gauge go up and down, so id assume the wiring diag isnt correct. Any ideas?
 

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