Dinghy Odometer Reading - revisit

[snowbirdtogo]

This past week I towed our 1990 Acura Legend down to Myrtle Beach SC
and back. I left the ignition key in position I (accessory)on way
down, odmeter still worked (443 miles), and position II(on)on way home
which also had the odometer working (446 miles). I didn't think the
Acura had a speedometer cable but maybe it does or I have to
disconnect some fuse to temporarilly disable the odometer. Any more
suggestions.
Roy Anderson
Sprinfield VA
1986 PT-40