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OFM,
May I ask what is the third wire (purple) for? Actually, by the picture it almost looks like the white would be the #3 wire?
These are available as mentioned at NAPA, or many automotive stores. Ford still carries them for mid '60's on up too.
The use of a hydraulic pressure switch is -OK- but they are very prone to failures. We use those mostly in building our Street rods.
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