In the Xe versions (ABS, HDC, TC) of the FL1 the speedo is all electronic and uses the ABS pulses from one of the front wheels (I think the drivers side).
I assume the signal to the speedo itself comes from the ABS computer but I am not sure - but if you have ABS etc the source pulse for the speedo is also there. I would be looking for something like a fuse, or connection up under dash. Of course the speedo itself could have a problem.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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