Help i have a 94 C220, petrol, manual gearbox. I understand that when NOT in gear the rpm limit is 4000, but my mercs rev limiter opperates at 4000rpm while in gear and driving, also the speed odometer is inop and i'm not sure if this is due to the same problem. i'm not sure how long the car has been doing this as i bought it as a none runner to work on as a project. Any help would be greatly appreciated.