Hello all I have 07-08 Peterbilt 389. My problem is at a stop my speedometer will sometimes bounce up and down from 0 to about 3. It is a problem when I attempt to do a regen. The regen will start and if the needle moves it kicks off. Rush Truck center in San Diego do not know why. That is no surprise from that place. But I would think someone else has had this same issue. Thanks