1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 348Get this manual
Sending Unit Adjustment
1The sending unit eccentric cam must be adjusted so that the gauge needle aligns with the lowest card mark just as engine trim DOWN movement stops2Tilt engine UP and engage trailering locks
"" 3To avoid personal injury, do not adjust the sending unit