Here's the pinout & wire color for the 77 - 79 "warning light" style cluster:
Pin # -- Wire Color -- Function
1 -- Black -- Ground
2 -- Tan -- Brake Light
3 -- Pink -- Fused +12V Feed from IGN Switch
4 -- Black -- Ground
5 -- Tan -- Fuel Gauge Sending Unit
6 -- Unused
7 -- Dark Green -- Temp Light
8 -- Unused
9 -- Dark Blue -- RH Turn Signal Indicator
10 -- Black -- Ground
11 -- Gray -- Cluster Illumination
12 -- Brown -- "GEN" Light
13 -- Dark Blue Dbl White Stripe -- "OIL" Light
14 -- Pink White Stripe -- Fasten Seat Belt Indicator
15 -- Black -- Ground
16 -- Unused
17 -- Light Blue -- LH Turn Signal Indicator
18 -- Light Green -- High Beam Indicator
Pin # -- Wire Color -- Function
1 -- Black -- Ground
2 -- Tan -- Brake Light
3 -- Pink -- Fused +12V Feed from IGN Switch
4 -- Black -- Ground
5 -- Tan -- Fuel Gauge Sending Unit
6 -- Unused
7 -- Dark Green -- Temp Light
8 -- Unused
9 -- Dark Blue -- RH Turn Signal Indicator
10 -- Black -- Ground
11 -- Gray -- Cluster Illumination
12 -- Brown -- "GEN" Light
13 -- Dark Blue Dbl White Stripe -- "OIL" Light
14 -- Pink White Stripe -- Fasten Seat Belt Indicator
15 -- Black -- Ground
16 -- Unused
17 -- Light Blue -- LH Turn Signal Indicator
18 -- Light Green -- High Beam Indicator
