How many miles?
Does it not have an extra digit? My old '88 I think had the old analog style (for lack of a better term) and my '96 has digital. It's been a while since the truck has been below 100k but I think it didn't show the 6th digit until it reached 100k.
If the truck is within the same state go to the dmv or call and they have records, emissions, inspections, title transfer ect. You can use power of deduction to determine mileage, who knows might be 2 hundred thousand.
My '87 had 159,ooo km and it had the 1 showing. You should have an extra blank spot left of the 4. Unless it was a million and 47000 (not likely). I thought they all had the extra digit by the '80's





