1997 Johnson Evinrude "EU" 40 thru 55 2-Cylinder Service Manual, P/N 507265, Page 336Get this manual
Sending Unit Adjustment
1The sending unit eccentric cam must be adjusted so that the gauge needle is aligned with the lowest gauge mark with the motor trimmed all the way DOWN2Check if the gauge needle is above or below the lowest gauge mark Tilt engine UP and engage trailering lock 3To avoid personal injury, do not adjust the sending unit eccentric cam while the engine is being tilted
4When the motor is trimmed all the way DOWN, the sending unit lever touches the eccentric cam just forward of the top of the cam at about 5Loosen cam screw and rotate eccentric cam to adjust fu II down gauge position: If the needle was above the lowest markmove the thick part of the cam TOWARD the contact point Tighten the screw, and recheck the gauge reading If the needle was below the lowest markmove the thick part of the cam AWAY from the contact point Tighten the screw, and recheck the gauge reading6Tighten eccentric cam retaining screw and check needle position at full trim DOWN