i read thru most of those links yetserday and the restg just a minute ago. i'm realizing that i may have tested the wires wrong. i need to know which socket in that 8 socket head leads to which GP and what the extras are there for would be helpful too. any info?

also any idea on why i got readings the way i did?

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1980 300CD 281,000 miles. 9,000 mi on custom WVO system.