I'm in the middle of a m50tu swap from a 95 525i and am trying to figure out the pin out for the adapter plug. I found 1 site that had the pin outs listed so I followed it. Today I decided to check my work and came up with these results and now I'm confused. The list below shows what pin connect to what. Left is X20 and right is C101, I know I need to fix some of these but just want to make to see what others say to do before I redo everything.
Check light 8-12 Good
Engine temp 11-10 No connection Says to connect to Dynamic oil level?
Coolant temp 12-4 Good
Fuel Pump 13-13 Good
Tach 14-14 Good Speed to ECU
Starter relay 15-15 Good unloader relay?
Oil Level Static 16-2 No connection
Diag Connector 17-16 No Connection
Starter Ignition 18-18 Good
SI reset 19-11 Good
Engine Speed 20-9 Good
DME Ignition Power 21-7 Good Switched power
02 Sensor 22-6 No Connection 02 relay
Oil Pressure 23-5 Good Oil Pressure light?
OBC Fuel Consumption 24-8 Good
Alternator 25-1 Good Charge light?
Here are the diagrams I have found from the wiki and from R3v

Check light 8-12 Good
Engine temp 11-10 No connection Says to connect to Dynamic oil level?
Coolant temp 12-4 Good
Fuel Pump 13-13 Good
Tach 14-14 Good Speed to ECU
Starter relay 15-15 Good unloader relay?
Oil Level Static 16-2 No connection
Diag Connector 17-16 No Connection
Starter Ignition 18-18 Good
SI reset 19-11 Good
Engine Speed 20-9 Good
DME Ignition Power 21-7 Good Switched power
02 Sensor 22-6 No Connection 02 relay
Oil Pressure 23-5 Good Oil Pressure light?
OBC Fuel Consumption 24-8 Good
Alternator 25-1 Good Charge light?
Here are the diagrams I have found from the wiki and from R3v


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