J1939 Type 2 to Type 1 FG/2 Y Cable or slip them into the

or slip them into the wire holes on the back of the connector to monitor the signal while the injector is still connected

You have nothing to lose by trying MEFI Scan first

and do MEFI Calibration Translation

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J1939 Type 2 to Type 1 FG/2 Y Cable or slip them into theY cable for J1939 Type 2 systems. This cable includes one Type 2 Female (sockets) connector to plug into your vehicle connected to one Type 2 Male (pins) bulkhead connector and one Type 1 Male (pins) bulkhead connector. This allows you to plug one Type 1 accessory and one Type 2 accessory into one vehicle bulkhead connector. The Type 1 connector is wired to the secondary J1939 system on the Type 2 Connector. The 9 contacts are wired as follows: Signal