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TR2/3/3A grounds the tach and speedo dash lights

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sp53

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There is what I believe a ground wirer that grounds the tach and speedo dash lights at the large brackets on the knurled nuts and then the tail of the wire hooks to ground probably at the center dash ground ganglia. I could hook anywhere for ground, but wanted to know if anyone knows the original location for the tail hookup.
 
I believe it did originally run to the ground tie point on the back of the instrument panel.
 
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