I've got an 92 Izusu Mu 2.8td, today the rev counter decided to play up, at 100kms it's saying 3500rpms, normally it reads 2500rpms, at idle it's sitting on nothing, normally at idle it'd read just under the 1000rpms. Got in it later in the day and it starts of normal then goes silly again,
Any ideas any one?, also how hard is it to fit a after market one?