When adjusting the vacuum control valve on the back of the injection pump (the one that feeds vacuum to the modulator valve on the transmission), you need 0 inches of mercury at full throttle. Through searching, it seems that alot of people people move the entire sea of throttle linkages, causing the engine to rev. However, the lever that controls that valve can be disconnected, so that you can move the lever to the full throttle position for extended periods of time without getting a chunk of valve cover stuck in your forehead .

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1982 300D, black w/ palomino leather, 203K
2001 E320, champagne, 105K (Mom's)
1999 Dodge Dakota, squeaky & battered, 142K