Well, Mr. Wall, I am humbly and forever in your debt. I spent the afternoon trying to understand where the second switch might be, if it even existed for this car. So I followed your wiring diagrams and compared wire colors to the 3 pole switch I had installed. As you surmised, they did not match, meaning the switch in the upper far left of pedal bay to the left of the pedal is NOT the clutch switch. It is the Starter Immobilization Switch you discovered in the diagrams. So what about the clutch switch then? Guess what? NO Clutch Switch in the car.
I looked more closely at the box on the electrical diagram and wondered what each of the numbers meant. There is a 5 digit number X90089 (sorry not at home so may not be the correct number) that refers to a location diagram at the back of the troubleshooting manual. It showed the clutch switch to the RIGHT of the pedal. So from left to right as you look in the footwell is the Starter Immobilization Switch, the clutch pedal, the clutch switch, the brake pedal and then the brake switch. And indeed upon looking in my particular footwell, there was an opening in the bracket for the missing switch. I then dug around to see if there was a 2 wire plug up in the wiring loom. A difficult fine but it was there.
I had a spare 2 pole brake switch from gathering original cruise control parts and it not only fit the opening but also the plug! So I hooked up INPA, mounted the switch, adjusted the plunger and released the clutch pedal. OPEN circle in the Clutch Switch Input! Unhooked INPA and took the car for a drive - or should I say cruise? Just fantastic! And it is a very nice cruise control as well.
I am beyond thrilled Murray! And as a big bonus, the issue with the revs hanging when the clutch pedal is depressed is totally gone. I now need to re-learn how to drive this awesome car. Thank you sir!!