http://www.vwt4forum.co.uk/showthread.php?p=1211972Connector Pinouts
Early Instrument Clusters (1990 -> 1995) - Single 28 Pin ConnectorPin Assignment
1 Outside Temperature Sensor - MFA (where fitted)
2 Low coolant level indicator
3 Ground (GND)
4 Memory reset switch - MFA (where fitted)
5 Ground (GND)
6 Memory switch - MFA (where fitted)
7 Speedometer Output signal - MFA (where fitted) otherwise N/C
8 Oil Pressure (high pressure switch)
9 Oil Pressure (low pressure switch 0.3 Bar)
10 Engine Speed Signal (W on diesels from ECU on petrols)
11 B+ (terminal 30 )
12 Instrument back lighting
13 +12V ignition ( terminal 15 )
14 N/C
15 Call button - MFA (where fitted)
16 Alternator Warning Indicator
17 Oil temperature - MFA (where fitted)
18 Dual circuit brake system warning and handbrake /or seat belt warning system (highline clusters)
19 Outside Temperature sensor input - MFA (where fitted)
20 Glow Period Warning (Diesel Engines)
21 Fuel gauge
22 Left Turn Signal
23 Coolant temperature gauge
24 Right Turn Signal
25 Main Beam Warning
26 Fuel Consumption signal ( Petrol Engine only from 01/93)
27 Speedometer Input signal - MFA (where fitted) otherwise N/C
28 Display Select - Auto box (where fitted)
Mid Era Instrument Clusters (1995 -> 1998) - Single 28 Pin Connector
Pin Assignment
1 Outside Temperature Sensor - MFA (where fitted)
2 Low coolant level indicator
3 Ground (GND)
4 Memory reset switch - MFA (where fitted)
5 Ground (GND)
6 Memory switch - MFA (where fitted)
7 Speedometer Output signal
8 Oil Pressure (high pressure switch)
9 Oil Pressure (low pressure switch 0.3 Bar)
10 Engine Speed Signal (W on diesels from ECU on petrols)
11 B+ (terminal 30 )
12 Instrument back lighting
13 +12V ignition ( terminal 15 )
14 Rear Fog Lamp Indicator
15 Call button - MFA (where fitted)
16 Alternator Warning Indicator
17 Oil temperature - MFA (where fitted)
18 Dual circuit brake system warning and handbrake /or seat belt warning system (highline clusters)
19 Outside Temperature sensor input - MFA (where fitted)
20 Glow Period Warning (Diesel Engines)/CAT Overheat (Petrol Engines)
21 Fuel gauge
22 Left Turn Signal
23 Coolant temperature gauge
24 Right Turn Signal
25 Main Beam Warning
26 Fuel Consumption signal ( Petrol Engine only from 01/93)
27 Speedometer Input signal
28 Display Select - Auto box (where fitted)