Be sure you actually are getting oil pressure gauge senders. There was an idiot light sender in some Fords that may be confused with the gauge sender in some aftermarket catalogues. U.S. Pantera vendors have the correct part.
And at best, the real sender is amazingly IN-accurate. I once borrowed a dozen senders from a shop and, plugged into our engine & stock gauge, I got NINE significantly different pressures- one was 50% off! I use the stock electric gauge as an idiot-light, with a mechanical gauge plugged directly into the engine on a tee fitting when I want real oil pressures.
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