WHY added gauges? Because the diesel truck manufacturers have a gas
engine mentality where OEM supplied gauges are concerned, and the
engine monitoring that might be adequate for a gasser, is WELL below
the basic needs for a diesel engine!
My wise old mechanic who has worked on Mercedes for years told me that
if I put one gallon regular gas to a diesel tankfull after about every
four tanks that it would perform essentially the same job as a fuel
injector cleaner at a fraction of the cost.