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89 240 Wagon- Wiring question replacing the Big Clock with a tachometer. 200

I'm preparing an '89 240 wagon for my daughter. Right now, the car has the "Big Ben" clock. I have a tach that fits this space, but I don't know about the wiring.

The back of the tach has one single prong. above it is stamped this way.

JMP

12 V

1
At the top, there are 3 prongs
+58 -31
+30
I was hoping that someone could tell me what to look for when I take the instrument panel off to remove the clock and replace it with the tach.

Thanks for any advice.






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