[sammyg2]

Supposedly, with tape you use 1 1/2 wraps for new threads that have never been tightened and 2 1/2 wraps for re-making used threads.

for natural gas you need to use special yellow gas tape, not the standard white stuff. Not sure why, something to do with code.

I wouldn't use either for natural gas but that's just me.

The real problem with tape is that even if it's assembled correctly (wrap direction of threads, stay back at least one thread) as soon as you take it apart you'll have slivers of tape stuck in there that are a bugger to get out.

Put it back together and those slivers tends to go to other places, often where you don't want them.