Thanks I was afraid of that

The only important piece of information from the connector is the duty cycle, which is on Pin 3. You can use a $30 meter with a duty cycle, or and old-style dwell meter to measure it. Tons of posts on how to do it if you do a Search.

What is the car doing or not doing that makes you want to read codes?

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe