If I add AFR gauges, will the sensor live in a gil exhaust if the bung is placed in the riser as close as possible to the manifold, or will water kill it? I hear they are very sensitive, but gil tails are pretty long (wet not dry). I know a lot depends on the cam, but without exact specs, say for a 454 with cam in the 230-240 duration range 114 lobe separation.

You should be just fine. Just put it as close to the manifold as possible. I usually put them just above the nipple for the water hose. You don't have the short risers set up for silent choice do you? If so, you could get some water on the sensor, but you would also probably have reversion issues with that cam anyway.
Eddie

They are the longer risers, no silent choice. Thanks for your input, sounds like it will be fine.

You need to just buy a FASTech already set up!!! Say a 271, for about 18K. lol

You have sensors on yours now? Any pics?

No just messing with ya!! Just set up to run good!! Your doing good, I take it.

Yes, and you? What's next? I should be headed to Texas this fall I think. Here is a fly by on the Kennebec river in maine:
https://m.youtube.com/watch?v=M5T1L8dwZKc

That is f'in sweet!!! Send me some dates when your down here. I don't winterize until October. The group is thinking of fall fun run, wife may be busy. Lake Travis is full, and way different from last time!!! So yes, married now and taking of the wife and mistress!!! (Venom- FASTech)

Cool, congrats on the marriage too. I'll let you know when I'm planning on being down there. Maybe the timing will work out. Good news on the lake levels too.
-J

You could go this way also. Jeff can build them for Gil as well.

http://wagsengineering.com/wp-conten...or-300x210.jpg

http://wagsengineering.com/products/...sensor-spacer/