Hi are all the other instruments working?
you could pull out your instrument binacle to check the connection. Theres just a few large hex bolts to remove, two at the top toward the windscreen nd two underneath the binacle. The instruments can then be wiggled free. All the wires are on a single connector, a bit like a small scart socket with a plastic lock clip. check that the pins are all in place and not bent.
After that im lost.
Best of luck. J