It looks like a GM truck cluster.
If it is, it could make sense.
The XL was a smidgen over 3000rpm at 110mph coming home from Memphis, flat road central GA.
If you put 3.73s, an Allison with its .71 OD, and a 32-33" tire you'd probably get there.
LS motor in a gmt800 might also manage that downhill with a hurricane behind it