I Have a 140 s class 400 sel and the rev counter works intermitently when it goes off the engine also runs lumpy and cuts out i would appreciate a wiring diagram or diagrams for this model so i can check the td or tn signal is present going to the cluster.
If there is anybody who can help i would be very grateful as a new instrument cluster is £762.02 an expensive guess!!!!

 

what the hell is the rev counter? you mean the tac?

 

I`m english in england we call tachometer the rev counter the gauge on the right hand side that moves when you rev the engine that is why it is called a rev counter