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Duty Cycle Test Connection

Hi All:

Excuse my ignorance. I am and probably will continue to be an electronics
moron.  I have a question(s) about connecting a dwell meter
to check duty cycle. The Bentley refers to a few Audi tools and is
confusing - to me at least.  My ride is an '86 5KCSTQ.

1)  Is the test connector the two wire unit right behind the waffle-like
    air duct?
2)  Do I just connect the dwell meter directly to the test connector
    and read away?
3)  Will the polarity of the connection affect the reading?  That is,
    do I have to have + to + and - to -?

Told you I was not the brightest bulb!

TIA as always,

Mark Pollan, '86 5KCSTQ 244K Miles

P.S.  I have the Probst FI book but it doesn't detail the connection