cos the auto ecu is inside the car, along with the aito shifter, auto clocks, all linked to know if the car is in neutral/park.
otherwise the car won't start cos it thinks its in gear....notice how the srv only starts in park?
there looks to be all kindsa shit still in my interior behind the dash that is to do with the auto engine loom, but cos i've kept it all i'm just tricking it into thinking it's in park. My park light still lights up on my clocks, as do the reverse and neutral lights when i'm in reverse and neutral.
As said already too, you'll need a non nats sr20 loom and ecu anyways whic isn't the easiest thing to find.
it might work, but i wouldn't count on the manual engine loom just working with the auto interior