Try swapping pins 2 and 3.

And I'm not sure, but I think the PC is wired backwards of the empeg, in other words, you might have to swap 2 and 3 back when hooking to the empeg.

And honestly, I never got any output on the PC, I just plugged straight into the empeg and ran GPSapp.

Also, verify that pin 10 really is ground by opening the streetfinder and looking at it. You could theoretically have them the wrong way 'round.
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Tony Fabris