1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 336Get this manual
Sending Unit Adjustment f1l 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
ill eccentric cam while the engine is being tilted or when the
engine's weight is not supported1al 4Loosen eccentric cam retaining screw tric cam to adjust needle movement