Ok, my car has a reverse light switch towards the bottom of the column with 2 prongs for the reverse lights:
And here's the replacement switch for my 79 Malibu that they sell in the parts store, it has 5 prongs.
The LS PCM wants to see a ground signal on pin 34 on the C1 PCM connector so that it can adjust the RPM. I'll use the contacts on this switch that are closed in Park and Neutral to do so, one prong will go straight to ground while the other prong will go to pin 34 on the C1 connector.
The neutral safety switch on the transmission will now be done away with. Wanted to utilize one on the column instead of running an extra switch I don't need on the transmission.