I'm not sure what Ed at fast chips uses, did the piggy back chip he sent you look anything like the Moates G1 memory adaptor?

I use an APU1 and have been happy with it, I've used it with my 94 Chevy van and my 95 GMC Yukon.
I did buy a GP1 package so I could fit the programable chip to my PCM but if you don't need the quick change ZIF socket and a spare chip then you could just buy the G1 memory adaptor.
I also later bought the HDR1 memecal header only because with the APU1 it allows you to read the contents of the stock chip.