Sounds like you have confirmed that the problem is not with the sensor, so I'd suspect a wiring fault or a cluster issue.
Does the gauge just stay at 11:00 all the time, from the time you start it to the time it's fully warmed up? Or does it move as the engine warms up, but indicate incorrectly?
What year is your car? 740 and 940 instrument clusters from 1991-1993 frequently have problems, and 1994-on can still be troublesome too.
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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