1985 OMC 65, 100 and 155 HP Models Commercial Service Manual, PN 507450-D, Page 419Get this manual
Adjusting the Trim Sending Unit 100 and 155 In some cases, it may be necessary to adjust the trim sending unit to coincide with the trim gauge at full trim up positionTo do this, proceed as follows: 1Turn ignition key to the "ON" position
2Raise the engine, with the tilt switch, to maximum up trim position3Move the angle adjusting rod
to the center hole
4Loosen the sending unit screws sending unit can be pivoted
only snug, so the
5Lower the engine all the way down against the angle adjusting rod
11641 11651
6Observe the trim gaugeIf the needle does not show center positionadjust the sending unit by pivoting it up or down with screwdriver, until the gauge shows the needle in the center position7Raise the engine and tighten the sending unit screwsLower the engine and recheck the gaugeReadjust if necessary8Raise the engine to remove the angle adjusting rod and rein sert the rod into the innermost hole