91-95 should be interchangeable. The TCU will have a green connector. A grey connector would be from the earlier Renix, and a red connector would be from a grand cherokee with the chrysler tranny - neither of those will work properly. If you have someone near you, a temporary swap with a known good unit might be very helpful. If your near North Idaho, I have a spare 91 on the shelf I'd give you.
No wire on D1 is normal as the TPS supply voltage comes from the engine computer whereas the Renix setup supplied voltage from the TCU. C14,C15,C16 good as in within the acceptable resistance range, I presume?
With the key on, in park. Do you see voltage on pin C16 (solenoid 1)? To command the shifting, the TCU applies voltage as follows. Note that manually shifting overrides this:
1st Solenoid 1 On, Solenoid 2 Off
2nd Solenoid 1 On, Solenoid 2 On
3rd Solenoid 1 Off, Solenoid 2 On
4th Solenoid 1 Off, Solenoid 2 Off
Solenoid 3 is the t/c lockup.