My MB injection pump guy laughed at the $2,000! Luckily you didn't get "had". You still ought to have the wrecking yard one calibrated. Its $250.00
The tolerance requirements are pretty close, and considering the cost of fuel these days, it might be worth looking into.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)