For the benefit of the next person asking: The change to high impedance was with the '89 model and up. The low impedance (88 and earlier) had yellow tops; The high impedance (89 and up) had green tops. You can run high impedance injectors on a pre89 MKIII by bypassing the injector relay; You cannot run low impedance injectors on a 89+ (not by just adding the resistor).
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