Connect the S(tart) terminal on the oil pressure safety switch to the S terminal on the solenoid.
Auto parts, hardware, or electrical supply stores should have a spade terminal adapter that has 1 female and 2 male spade connectors on it. The female end goes on the S terminal, then the male ends take your stock starter signal wire and the new wire to the safety switch.
(EDIT: These are apparently called "double male" terminals/adapters and come in "chair", "flat tab" and "piggy back" types -- Dorman part# 85412 comes with 2 of each for about $3 at Pep Boys or $2 at O'Reilly. Or, you could find a piggyback crimp-on terminal for your safety-switch wire, which has a female spade connector with an extra male spade forking off of it for your starter signal wire.)
The way these safety switches typically work, there's an internal switch that flips whether the (P)ump terminal is connected to the (S)tart terminal or the (I)gnition terminal. At rest, P is connected to S, then oil pressure flips that to connect P to I instead. This can be handy to know in case the switch ever fails, as you can probably just swap the I wire over to the S terminal to get going again until you can replace the switch.
Ideally, you'll also want that P(pump) wire triggering a relay that sends power directly from the battery (+) terminal to the pump, rather than having power from the ignition switch go thru the safety switch directly to the pump.
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