1995 Johnson/Evinrude Outboards 25, 35 3-Cylinder Service Manual, Page 280Get 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 DOWN[]] [[] 2Check 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 full 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 position at full trim DOWN, needle