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Old 02-24-2017, 08:33 PM   #3
ray_mcavoy
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Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,354
Re: 72 water temp gauge grounding? Also questions about printed circuits

Yes, that lower nut on the fuel gauge connects the gauge to ground via the tin cluster housing.

If I remember correctly, the studs on the backs of the gauges have #6-32 threads.
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