I've been reading alot of posts on the duty cycle but most appear to be for 1985 and later cars. My 1980 was the first year for lambda system.

I purchased a Sears dmm with duty cycle. The CD say's connect "voltmeter" with black lead to pin 3 and red to 12 volt source.

Most of the posts I've read say to connect red to pin 3 and black to pin 2. This is the way I proceeded, and couldn't get the % any lower than 632 before stalling.

On an early model 107's using a duty cycle dmm which way should I connect the red/black leads? Black on pin 2 / red on 12v, or red on pin 2 black on pin 3?

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