For sure the sw on 4 spd is for backup lights.
Hopefully, the trans you intend to drop in has a switch. If you're lucky you also have the connector and a short length of the donor car wiring harness.
I think (but not sure) your car's b/u light sw is on the console close to the shifter, possibly integrated with the P/N start inhibit sw.
I the above is correct, you need to connect the two wires that formerly connected to your car's b/u light sw to the sw on the side of the 4 spd. Polarity is not important.
Good luck,
Bill
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