1994 Johnson/Evinrude Outboards 40 thru 55 Service Manual, Page 330Get this manual
Sending Unit Adjustment r:jl 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
r:;l rJ 2Check if the gauge needle is above or below the lowest L!J gauge mark Tilt engine UP and engage trailering lock
i eccentric cam while the engine is being tilted
'" 3To avoid personal injury, do not adjust the sending unit