Does anyone know where I can get a good manual that describes the theory and operation of the KE Jettronic system?

I have looked hard at the interject website. They don't tell you much, it seems that they're just trying to sell your their test system.

Thanks for any help you can offer,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles