1974 Ski-Doo Shop Manual, Page 169Get this manual
ADJUSTMENT OF SCALE NO.3 FOR TESTS NO3-11 1Turn selector switch to position No.3COIL CONTINUITY2Temporarily attach the red and black test leads together3Turn meter adjustment knob for scale No.3 until pointer aligns with set position "0" on right side of scale Disconnect leads4Proceed with test No.3 or No11 Note: Always readjust scale No3 before starting these tests (3771