the injection pump calibration i beleive measures the amount of fuel injected per cycle measured over many cycles and set to the spec.you could theoretically measure this on the car by collecting the fuel and comparing each element having run the engine for the same duration each time.the other spec would be the vertical position and travel of the individual plungers coming to engine tdc.probably best measured with a dial indicator.the adjustment process here would be shimming under each plunger.considering the precision requirements of these measurements and adjustments a fairly reasonable fee charged by a expert fuel injection for this service would seem to make sense

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michael cole 1980 300SD gone now but not forgotten,87tdt,90 300te 4matic 95 e320 wagon