Idiot oil light just lit after intake swap.

Just put a new intake manifold and carb on my 76 Duster with the 318. The idiot light on the dash has never lit since I bought the car. Now since the intake swap its been on constantly. The car had a aftermarket oil pressure gauge attached under the dash when I bought it.

I know where the oil line hooks up for it is cause I had to replace the line when it blew up on me one day. I have good oil pressure according to the gauge. Is there a sending unit for the idiot light? I got rid of the EGR system in the swap and obviously got rid of the factory electric choke.

Just wondering if I disconnected a wire to a second oil sending unit or something. Any ideas?