you're right about persistence i got it figured out.

just unscrewed the two screws holding the face in and twisted the face until i was able to fit a small phillips through either the odometer or tripmeter openings and popped the new tripmeter works in.

4.2 '87 yj, 263,000 miles, mopar mpi, 33" mud bfg, skyjacker 4", 3.73 gears, arb lockers-f and r., tom wood's 2.07 shaft conversion, tom wood's hd driveshaft, magnaflow/custom exhaust, 4wd bumper/swing-out tire carrier