Thanks for the replies. I'm electrically illiterate, so bare with me.

I checked the ignition switch, was getting continuity in both wires (R/B and R) from the switch to the PGMIII harness. The voltage read 12.5 (R) and 0 (R/B) when OFF, 12.5 in both when ON.

Checked the continuity from the TPS connector to the harness, fine on all 3 wires, but didn't check the sensor or connector itself.

I did notice that when the TPS connector was disconnected, the powerservo motor moved when keys went to ON and when I tried to kick it to start. But when reconnected, didn't budge. Is that normal? How else can I check for full functionality of the TPS?