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Hi Volks,
     The digijet ecus have ground pins 6 and 7 common.  They are soldered to
the same land pattern on the printed circuit board. Pin 6 also has  a wire
going to the heat sick and is attached to it with a screw. These connectors
and heat sink are internal to the ecu. I mention this because some digijets
vans 83.5-85  seem to run ok with the ecu laying on top of the engine and
others will not run so good especially at  higher rpm. The ecu cable
connects pin 7 to the left cylinder head. The ecu when properly mounted has
three screws attached to it. The bottom one provides a ground from the heat
sink to van frame.  If you experience strange problems, rough , stumbles,
 ucking  be sure to check these grounds. The hardware that suspends
the ecu seems to lack qualities that provide for a good quality ground . If
you experience problems it may be advantageous to add a quality ground from
the engine to the ecu lower mounting hole. This  later ground addition is
the idea of fellow listee Jim Maginel who has been  a great help installing
and testing ecus and digitools on his 85.

Darrell