Here it is, From my ESI Software.
Pin
Wire Color
Circuit No.
Function
A1
BRN/WHT
419
MIL Control
A2
--
--
Not Used
A3
BLK/WHT
174
Low Washer Fluid Indicator Supply Voltage
A4
DK GRN/WHT
817
Vehicle Speed Signal
A5
WHT
121
Engine Speed Signal
A6
GRY
1036
IPC Class 2 Serial Data
A7
--
--
Not Used
A8
DK BLU
2115
Right Turn Signal Lamps Supply Voltage
A9
--
--
Not Used
A10
DK GRN/WHT
1932
Transmission Shift Select Switch (Park) Signal
A11
RED
2353
Instrument Panel Lamps Dimming Supply Voltage
A12
BLK
1050
Ground
B1
LT BLU
2114
Left Turn Signal Lamps Supply Voltage
B2-B3
--
--
Not Used
B4
ORN
1816
DIC Mode Switch Signal
B5
DK BLU
894
DIC Toggle Switch Signal
B6
DK GRN/WHT
1358
DIC Switch Signal
B7
YEL
1327
DIC Fuel Signal
B8
--
--
Not Used
B9
PNK
639
Ignition 1 Voltage (w/o 8S8)
PNK
739
Ignition 1 Voltage (w/ 8S8)
B10
--
--
Not Used
B11
ORN
2840
Battery Positive Voltage (w/o 8S8)
ORN
4540
Battery Positive Voltage (w/ 8S8)
B12
BLK/WHT
1851
Ground
72 Chevy Stepside
Not sure, 5.3 or Lt1