Cummins Electronic Control Module ???

cummins ecms don't have a separate mileage chip everything is internal in a sealed ecm the insterment cluster is fed from a data link directly from the ecm this includes the speedo, tach oil pres and engine temp. if the new ecm was programed by cummins without having the old ecm and or if the ecm was totally dead and would not communicate then it was probably programed using only the ecm code if that is the case then all of the customer parameters need to be programed. the rear axle ratio and the tire revolutions per mile and the number of teeth on the trans sensor need to be accurate for the speedo and milage to be accurate. it is a good idea for anyone with an electronic engine to get a printout of the customer specified parameters at some time when they are in a shop with cummins insite for a cummins engine or cat et for a cat it makes it a lot easier to get everything set back like it was if the ecm totally fails