1974 Ski-Doo Shop Manual, Page 171Get this manual
ADJUSTMENT OF SCALE NO.2 FOR TESTS NO4-5-9-10 1Turn selector switch to position No.2(DISTRIBUTOR RESISTANCEfor checking low ohm values,) 2Do not clip test leads togetherTurn meter adjustment knob for scale no2 until pointer aligns with set position "0" on right side of scaleNote: Always readjust scale No.2 before starting these tests (4,5, 9, lOJ