Using the Static Test procedures found here:
http://landiss.com/mixture.htm
(2nd to last section "Static Tests")

I found that when I pushed down on the air plenum, the duty cycle reading became: 9.3% (10% is desired)

I found that when I actuated the throttle linkage to WOT, the duty cycle reading became: 19.2% (20% is desired)

So it seems that my car passed the static tests.

Also, strange... Port 2 of the X11 diagnostic connector is Ground... yet if I put the red probe of my DMM into this port and the black probe of my DMM into port number 3, I get inverted readings... meaning that at ignition position II before engine start, the reading is 30.6% instead of 69.4%...

I have to put the red probe in port 2 and the black probe in port 3 to get the correct readings... yet this is backwards?

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2006 BMW M5 "Heidi" @ 109,000 miles
2005 MBZ C55 AMG "Lorelai" @ 165,000 miles
1991 MBZ 300E "Benzachino II" @ 165,000 miles
1990 MBZ 500SL "Shoshanna" @ 118,000 miles

(On the hunt for a good used M103 engine as of 6/10/23, PM me if you have one to sell!)