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The actual ground is in the harness but I'm not sure which pin it is, I was having an odd instrument problem a little ways back so I just added my own ground wire to the dash just to be certain. I just backed out of the little screws a little bit on the tach amp side and ran a wire from there to the chassis.
I think you have to pull incredibly hard for that fitting to come apart, it'd be much more realistic if it were bent to far and snapped. I just use the smallest adjustable I have to tighten it so I know it isn't to much and is easy to undo when I don't have much room to work with.
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