Welcome to the forum.
Not sure about the B9, but the M59 speedo has only 1 connector on the back. It controls all functions including backlights. If there's a similar connector on the B9, maybe worth re-seating that?
Update, just had a quick look on ebay. Looks like 2 connectors on the B9, not sure what they both do but a re-seat probably won't hurt. Might be worth disconnecting the battery first, but wait for the car to go into sleep mode (leave for 10 mins with bonnet open so you don't have to open a door to get to the bonnet catch) .
Not sure about the B9, but the M59 speedo has only 1 connector on the back. It controls all functions including backlights. If there's a similar connector on the B9, maybe worth re-seating that?
Update, just had a quick look on ebay. Looks like 2 connectors on the B9, not sure what they both do but a re-seat probably won't hurt. Might be worth disconnecting the battery first, but wait for the car to go into sleep mode (leave for 10 mins with bonnet open so you don't have to open a door to get to the bonnet catch) .
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