Well a quick check of the wiring diagrams of these two years shows that the '90 module actually has 12 connections that do anything, while the '94 has 13 plus a ground. That ground may be your last connection, but i doubt it because you said it runs fine. Here'* the pinouts for the '90 and the '94 (90'* by pin letter and '94 is by color of wire, as far as i can decode):
A: WHITE to C8 on PCM
B: TAN/BLACK to C7 on PCM
C: Lt.BLUE/BLACK to D11 on PCM
D: PURPLE/WHITE to D8 on PCM
F: BLACK to C5 on PCM
G: BLUE/WHITE to CRANK SENSOR
H: Lt. BLUE/WHITE to " "
J: BROWN/WHITE to CAM SENSOR
L: BLACK/RED to D9 on PCM
M: GREY/RED to both CAM and CRANK SENSORS
N: WHITE/BLACK to " "
P: PINK/BLACK to FUSE #17, FUEL PUMP RELAY, OIL PRESSURE SWITCH
1994 (they only had colors, sorry)
WHITE- To gauges
RED/BLACK- B7 on PCM
BLACK- B9 on PCM
another WHITE?- B16 on PCM
TAN/BLACK- B15 on PCM
PURPLE/WHITE- B8 on PCM
Lt.BLUE/BLACK- B6 on PCM
PINK- Fuse 6 20A
BROWN/WHITE- In from CAM SENSOR
RED/BLACK- In from both CAM and CRANK sensors
WHITE/BLACK- In from both CAM and CRANK sensors
YELLOW- In from CRANK sensor
Lt.BLUE/WHITE- In from CRANK SENSOR
There you go hopefully this just makes sense to someone.
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