Well, I haven't touched the car in two years, so not in a rush. Just something I was concerned with after hearing about the leak from my co-worker?
He just said there was a leak, might not even be O-ring related, but the car is setup for flex fuel. The FAST 2.0 can be setup to use a GM flex-fuel sensor to adjust for the alcohol in the fuel. I also bought a knock sensor with the 1/8 NPT mounting to check out, mounted in the lower water drain on the side of the block.
I don't expect it to really work for timing retard (at least not till I have more data), but I can monitor and log it.