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Usually the tach gets a signal from a hall effect sensor mounted on the bell housing the wires can become unplugged or even damaged i would start by having a look at the wiring and connections from the sensor all the way to the tachometer. Rpm dont work on 379 peterbilt submitted 4 years ago category need a wiring diagram for a 1998 peterbilt 379 ext hood for the engine compartment and cab at a shop with my 2005 peterbilt 379 c 15 cat my speedo tach and fuel also battery volt meter all quit working but the rest of the gauges work. Raneys info toll free 1 888 888 7990 local 352 789 6701 store location 3030 w silver springs blvd ocala fl 34475 exit 352 off i 75 visit our store hours of operation customer service hours mon friday 900am 500pm est. Easily find what you need from thousands of parts available used rebuilt salvage engines transmissions rears cab and body more