Neutral/Park Switch signal to ECM

[Mrrilla]

I swappped TPI motor into my truck and everything runs good except I didn't hookup the orange/black (B10) wire that tells the ECM that the truck is esseciatley in drive. The idle RPM could be a little higher when in gear.

I believe the ECM can get this "ground" signal from the Neutral Safety switch except the unit that is in my truck is 4 prong (2 ignition, 2reverse).

I was thinking that maybe I could install a later model truck TBI NSS or something like that. So to everyone that swapped in an EFI motor, how did you send this signal to the ECM?

Attached is a picture of my current NSS