Very low, --25 hrs take off from a engine testing facility.
These units are like new

these are for ISM ISX semi truck engines, your #s may vary, but the 551's are all interchangeable I believe.
these are 0ver $4000.00 new
mine are $1500.00 very substantial savings opportune~ ity

truckeez at the yaw who

I ialways have picture posting dilemma's here - sorry I cannot supply pics