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The early model TPI cars had an additional sensor installed in the third threaded hole. It might have been for the cold start injector. I'm sure someone will chime in.
I think, not sure, that 90s didn't have a cold start injector. So you would'nt have anything from the old manifold to fill the whole. Just get a threaded plug, put on a little teflon tape and screw it in.
If I remember correctly, there were SR runners that did allow the use of the cold start valve, thus the third hole in base. I polished up a brass plug for that hole.
I think, not sure, that 90s didn't have a cold start injector. So you would'nt have anything from the old manifold to fill the whole. Just get a threaded plug, put on a little teflon tape and screw it in.
Paul
That's what I did. My original manifold had that passage plugged so I plugged it on the ACCEL. I always suspected that the F cars had a need for an additional coolant access point.