Was looking for a used one on the scoop.
Nordic454 was selling a scoop awhile ago for a pretty good price. Dunno if he sold it or not. I assume you're talking about the butterfly scoops patterned after the Enderle hat? Nordie would know!

Yeah, as far as cables, just go new G. Tom Manier at JPB or Jim Brock at Cyclone Speed and Marine. Not worth saving a buck or two to be stuck floating down river or in the middle of the lake over $20 or so. (I'm not sure either of them will even SELL you a used one for that matter. They save them for their personal machines, or toss them, correct me if I'm wrong).
Guages, not much help. Keep watching the FS listings here and on PB, but you're probably going to wind up just buying a matched set new. I've scored a couple deals that together made the complete new set I wanted, with a few extra and saved a buck, but thats a year of playing around and planning ahead.
Ray