Rev Counter Needle not stable

[Tonybolony]

Evening All,
Any suggestions?
Holding a constant(ish) 80 on motorway, after a few mins, the needle starts moving between 3000 and 4000rpm. No other apparent symptoms.
Is this a common one, or am I the only one to have this problem?
Thanks.
Tony.

[s2driveruk]

never heard of that before....faulty gearbox sender?

[Tonybolony]

Gearbox sender? For the rev counter? Surely it would be on the flywheel, or cam pulley? The speedo reading is constant, BTW.

[Bullysteeth]

does the rev counter hold still at other revs (below 3 and above 4)

[Tonybolony]

That's the strange part about it - at all other speeds up to 80 the needle is constant.
Not been on an Autobahn, so can't tell if it happens at 150mph

[Bullysteeth]

That's the strange part about it - at all other speeds up to 80 the needle is constant.
Not been on an Autobahn, so can't tell if it happens at 150mph

150 i wouln't dare

[Colesy]

Interested to find out what this could be, on one trip last year the rev needle dropped to 0 and shot back up immediately while cruising on the motorway. It did it twice within 10 mins but hasn't happened again.