Inline SPG?

[RJP]

Left unchecked I'd be diving with more ornaments than a Christmas tree. I had a feeling I was going a little overboard with this (no pun intended), so thanks for the reality check!

Less is more, dude. Less is more.

 

[rcs9250]

You don't really need an SPG to backup an AI computer during any given dive, because if the computer craps out, you're ending the dive at that point irrespective of tank pressure. Backup makes sense, but keep the SPG in your save-a-dive kit and swap it for the computer on the next dive (along with a depth gauge and timing device of course.)

+1 Hit the nail right on the head.

However, if you're hellbent on two gauges and knowing an inline gauge does not currently exist you have two options. First option is: use the second HP port on your reg. If you only have one HP port like some regs do you can use one of these gizmos.
http://www.omniswivel.com/files/HP-Y.jpg
http://www.gmcscuba.com/ProductInfo.aspx?productid=57215

Some will argue that you have introduced failure points or a weakness into your system. If you maintain the O rings in the devices annually you should be fine.
Good luck, dive safe.

 

[Fish in a Barrel]

Less is more, dude. Less is more.

Indeed. SCUBA has opened a whole new world of gadgets and ideas for me to experiment with, though. I'm sure in a year or two I'll have a box of SCUBA gadgets I've tried and rejected... just like the ones for camping gear and shooting accessories.

 

[=C=]

Sooo this is what I came here to suggest. But I also agree it's unnecessary because you have to thumb the dive.

+1 Hit the nail right on the head.

However, if you're hellbent on two gauges and knowing an inline gauge does not currently exist you have two options. First option is: use the second HP port on your reg. If you only have one HP port like some regs do you can use one of these gizmos.
http://www.omniswivel.com/files/HP-Y.jpg
Swivel: HP 7/16" w/2 ports

Some will argue that you have introduced failure points or a weakness into your system. If you maintain the O rings in the devices annually you should be fine.
Good luck, dive safe.

 

[diversteve]

My buddy took his SPG off his rig when he bought an AI wrist computer. It flooded on a dive and he had to sit out two dives. No lasting damage to the computer but:

Next time I saw his gear the SPG was back...

Show your buddy how to use your computer....

 

[DevonDiver]

DevonDiver, having thought about it, I agree with your CBA of this. No practical gain while adding another single-point failure.

I'd define an SPG as multiple failure points...

1) HP Port (o-ring fail, damage to thread etc).
2) HP Hose (puncture/burst).
3) HP Hose - SPG connection (o-ring fail, thread damage etc).
4) SPG (blow-out, seized needle).

OK, OK, you guys have convinced me! Diving is a new hobby for me, and I have a tendency to go a little gadget crazy whenever I pick up a new hobby.

CCR is heaven for gadget addicts....

 

[Fish in a Barrel]

I'd define an SPG as multiple failure points...

1) HP Port (o-ring fail, damage to thread etc).
2) HP Hose (puncture/burst).
3) HP Hose - SPG connection (o-ring fail, thread damage etc).
4) SPG (blow-out, seized needle).

Different definition of single-point failure. The usage I've seen defines it as a component whose failure renders the entire system inoperable. In this case, any SPG failure could also disable the computer's ability to sense air pressure, forcing me to thumb the dive.