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Hello,
Are you sure you have the correct switch?
In 1968, the headlight switch changes to a version with a breakaway knob where the knob has external plastic threads, but retains the dimmer function.
I have seen a 1968 122 with a 1968-1971 1800 headlight switch, but that switch does not have a rheostat to dim the dash lights and uses the later style of breakaway knob.
Can you supply a picture of the front and back of your switch?
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90501
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