JS2 refit

Once again I seek advice from members. What rev counter to use that runs via the ht lead? Scitsu is one but are there any others
out there,what is popular within the Bantam class? I would appreciate advice.
The reason for this inquiry JS2 now sports electronic digital ignition,electronic water pump,hydraulic clutch ect, I'm now thinking
on an idea for an electric seat that once activated after 9000rpm gives a sharp shock to the rear if the revs drop below 8000rpm
jocky would have to stand on foot rests to return to van, the system will then reset once the motor stops ( I hope you read this
Brian). Any advice on rev counters will be appreciated or for that matter the seat.

Les2012.