Omega occasional momentary fuel warning.

Anybody in here see this before?
I get an occasional red warning light on the fuel gauge accompanied by a
simultaneous loss of reading on speedometer and tachometer.
There is no adverse effect on engine running when this happens and it lasts
for only half a second or so before everything returns to normal.
It happens only once every few weeks or thereabouts.
I haven't carried out any checks yet as I thought I would post here first to
see if it's a common problem.
Any ideas please?
Regards
Patrick