Found out it’s electronic tacho and just changing sensor which is neatly hidden behind the fuel filter. Will give it a try and see if it solves the problem. Sensor is bloody expensive £175. So fingers crossed it works.
MF5465 2010 model with Perkins 6 cylinder. Rev counter keeps creeping up by a few hundred revs, engine remains the same. Has anyone any suggestion. Can’t find a sensor or any clue what it could be.