Ford speedo drops out at higher speeds?

Joined
Jul 2, 2007
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5,284
Currently my speedo will drop down to zero when I hit somewhere between 65 and 80 mph. Depends on the day. I think it's a ground issue as it comes back and drops out again when I push a window up/down button or turn the AC fan up or down.

Anyone else have this issue?

On a side note, I was running right at 3000 rpms in OD on the highway this weekend wondering how fast I was going... Only pushing 15 psi out of the SPS62 turbo with cool EGTs, just calculated it out at 110 mph. It's amazing how well this thing will move.
 
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