Gauge Wiring Help

[cooter55]

I'm going to swap out the mechanical Oil Pressure gauge for an electric one with sender I got out of a '79. I intend to hard wire and need to know the correct post connections on the gauge. Looking at the gauge from the back there are four posts at 12:00, 3:00, 6:00, and 9:00. Which ones are the 12v ignition, ground, and sending unit?
Thanks

 

[chengny]

From the back:

Ground is 12 o'clock

Battery voltage is 3 o'clock

Variable resistance to ground (through sender) is 9 o'clock

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[cooter55]

Thank you very much.....

 

[78stepside]

Exactly what I needed to find for my gauge!