1997 Johnson/Evinrude EU 25, 35 HP 3-Cylinder outboards Service Manual, Page 292Get 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 tilted4When 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