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4th BLUE/WHITE wire connected to GREY wire
4th BLUE/WHITE wire coming from the clip connected to the WHITE wire
RED YB wire tapped into the Yellow wire w/ Grey Dashes (NO Black Stripes)
BLACK YB Wire grounded
The Yellow box has built-in diags. In it on the instructions that shipped with it. But the short version is that either bad power connections (either one) of bad connections from the speedo wire will generate this issue. Pull the Yellow box out of the car, and install the small jumper connector that shipped with the YB. If you still have the issue, then it is surely your connections.
Stratocaster:
"install the small jumper connector that shipped with the YB"
I still have the jumper connector, but have no clue on how to connect that part. I'm thinking its my power wire because that's the only wire that I didn't solder together, so will try that.
The green wire has been switched to Grey I think because I don't have a Green wire at all and others in the YB Install thread also have Grey wires now.