I've figured out the power pins of the dashboard:

These are the pin assignments of the 32 Pin Connector on the backside of the dashboard:

See: http://www.polo6rfreunde.de/index.php/Thread/9562-Pinbelegung-Tacho-Stecker/ (German

Pin 1 - encoders for fuel gauge 1 (fully)

Pin 2 - encoder for fuel gauge 1 (empty)

Pin 3 - encoder for fuel gauge 2 (full)

Pin 4 - Encoder for fuel gauge 2 (empty)

Pin 5 - Not used

Pin 6 - Not used

Pin 7 - immobilizer -D2- (1) (no engine control unit therefore present not available)

Pin 8 - immobilizer -D2- (2) (no engine control unit therefore present not available)

Pin 9 - speed signal output

Pin 10 - Unassigned

Pin 11 - Oil level and oil temperature sender -G266-

Pin 12 - Unassigned

Pin 13 - indicator light Rear fog light (probably digital 1/0)

Pin 14 - beam indicator light (probably digital 1/0)

Pin 15 - transducer for brake pad wear, front left -G34- / donors for brake lining wear, rear right (probably digital 1/0)

Pin 16 - Terminal 31 (GND)

Pin 17 - Sprinkler water level sensor -G33- (probably digital 1/0)

Pin 18 - transducer for coolant shortage indicator -G32- (probably digital 1/0)

Pin 19 - temperature sensor for outside temperature -G17- (in most cars is a PT100, ie analog input)

Pin 20 - Terminal 31, sensor ground (GND)

Pin 21 - call button for multifunction display -E86- (MFA +) (no engine control unit available so possibly alternative occupancy)

Pin 22 - call button for multifunction display -E86- (MFA) (no engine control unit available so possibly alternative occupancy)

Pin 23 - Memory switches for multi-function display -E109- (MFA-R) (no engine control unit available so possibly alternative occupancy)

Pin 24 - Unassigned

Pin 25 - Handbrake control -F9- (probably digital 1/0)

Pin 26 - Warning Contact brake fluid level -F34- (probably digital 1/0)

Pin 27 - Oil pressure switch -F1- (probably digital 1/0)

Pin 28 - CAN data bus combo, High

Pin 29 - CAN data bus combo, Low

Pin 30 - Unassigned

Pin 31 - Power supply Terminal 15 (12V).

Pin 32 - Power supply terminal 30 (12V).

The dashboard is connected to:

+12 V at Pin 31, 32 and GND at Pin 16, 20

Info: It needs to be connected to both +12V Pins. However it only needs +12V to run.