[OldBlueVolvo]

Having looked at my diagrams again it would seem that the gearshift 'relay' is located in the middle row, second from the right (just to the left of the M46 overdrive relay). Check to see if you have this so-called 'relay'. The module is wired into the digital E-connection on the speedo (also used for cruise) and the tachometer. There is also a connection to the clutch pedal switch (present on cars with cruise control) but I don't know the purpose of this connection. The only other connections to the gearshift module are to the M46 overdrive relay, +12V, ground, and of course the up-arrow light on the dash.