Which screw on the back of the panel can you attach a wire to to make a ground?? Or does it have to be soldered onto the circuit board somewhere??? I kinda figured I might have broken a ground wire, but wasn't sure...I know you have about 9 screws on all 3 parts of the instrument cluster, wasn't sure which one connected to the ground circuit of the IC....

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Looking for another Mercedes 300D or SD as a project vehicle..