904 Speedo gear clocks???

????? I'm gonna need this explained differently please. What is IIRC?

if I remember correctly

(5) Note number of gear teeth and install speedometer
pinion gear into adapter.
(6) Rotate the speedometer pinion gear and adapter
assembly so that the number on the adapter, corresponding
to the number of teeth on the gear, is in the
6 o'clock position as the assembly is installed (Fig. 1).
(7) Install retainer and bolt, with retainer tangs in
adapter positioning slots. Tap adapter firmly into the
extension housing and tighten retainer bolt to 100 in.
Ibs. (1 1 N.m). Refill transmission.