All the PRND321 indicators work properly now. AND the Oil Level Light does not come on when put in gear. The surprise.... The temp gauge isn't working still.... but for some reason it has system voltage on it while running. It also does NOT self-test like it seemingly did before.
This system voltage is on pin M on the cluster harness that has the green temp gauge wire when the switch is on, but there is only millivolt power there on the connector itself when disconnected from the instrument cluster (my temp signal).
Now I have to figure out what is backfeeding this seemingly from the cluster itself.
BTW, I noticed another significant difference between the fuse panels. My old one has a 30A fuse in Fuse 39. The cover labels this simply as "AIR (30A)". The replacement neither has this fuse, nor are there electrical connectors for it, nor is there any reference to it on the cover. And in researching this, I cannot find this fuse 39 associated with a Grand Prix anywhere on the internet.