No Bus means there's a communication problem between the instrument cluster and the ECU. what the problem is I dunno.

 

yes the problem is with comunication between the engin and ecu. think about it. what links the two together? check your harness between the two, do wigle test at each plug, and check for chafing and broken wires. all your bus is, is your harness, just like your pc at home. as far as the bus thing displaying on the dash do the needles make a speep when you turn the key on? what do they do when you crank the truck? check fuel preasure defanatly. I don't now if you have a crank sensor, and or cam sensor, but think about them to.