electric fuel pump oil pressure switch pins gauge

I put in an electric fuel pump in my Barracuda, the fuel pump company suggested that I feed the power to the pump through an oil pressure switch as a fail-safe measure (good idea I thought). So Iinstalled a 3 prong oil pressure switch to feed the pump and send a signal to the OP gauge. It works, but unfortunately it pins the gauge.

Is the unit not designed to work with the gauge?

Is it the wrong OP sensor/switch?

Or do I need a capacitor or something prior to the gauge?