Hi Larry
Thanks for your reply.
>> You may want to wire it to the high beam circuit so you have an indicator.
That is exactly what I have in mind, but I’m also really interested to know what would have originally been in that position on the dashboard which, presumably, is missing from my car.
>> To remove the knob from the spark advance, you need to remove it from the dashboard
Hmm…. To remove it from the dashboard, it looks like the knob has to be removed first; the nut and washer that secures it to the dashboard are behind the knob. Unless I’m being really stupid (which is not out of the question)….