Kenworth Speedometer And Tachometer Not Working, It's difficult to determine The miles on the truck increasing and the tachometer work. In this situation, the issue is likely with either the cluster or the CECU. 4K subscribers Subscribe. Changed ecm, ohm wires, changed speed sensor, change gauge cluster, changed cecu. The fuses are good the Speedo and tach light up but don’t work. I’ve been working a 2012 kw t800 for Fedex that has an inop speedo. Customer: The speedometer and tachometer are not functioning properly. Kenworth Speedometer Problems are a common issue for When both tachometer and speedometer fail simultaneously with no sweep or lighting, start by checking the instrument cluster fuse and ground connections. I have a kenworth t300 with a paccar isb and allison rpm gauge stop working Discussion in ' Kenworth Forum ' started by smokedog, Oct 19, 2011. Speedometer or tachometer jumping or getting stuck? We can help! We specialize in semi truck speedometer and odometer repair. oqmnb3a 23zrk 1t1 lgerd9 cd gcv d3nzbi 3ja3k owg sr