[PSUBS-MAILIST] Gauge for outside viewport?

[Alan James via Personal_Submersibles]

Hi Alec,I took photos of those submarines last year, but nothing clear enough to zoom in on the gauges. They look like scuba gauges that have been peeled out of theirrubber housing. Very friendly people who I am sure would comfirm what they were, ifyou emailed them. David Columbo has visited them on Oahu & Vance knows them.(of course)Cheers Alan

      From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, September 21, 2015 3:03 PM
 Subject: [PSUBS-MAILIST] Gauge for outside viewport?
   
I have an interesting thing to think about and wondered if any of the PSUBS brain trust might have a suggestion.
One of the simplifications on my new sub is that all HP air lines are external, aside from the BIBS (which is normally shut off anyway). Thus, I'm looking for a 3,000-4,000 psi gauge to mount outside a viewport, like in the Pisces photo that I'll paste below. In case my paste doesn't come through, it is the one at the top of the following article: http://www.nytimes.com/2015/09/15/science/piloted-deep-sea-research-is-bottoming-out.html?_r=1
The first thing that came to mind was to use a SCUBA submersible pressure gauge, but the problem is these are normally 1 atm dry enclosures of limited depth rating. There is generally little information posted about how deep they'll go, but what I did find was mentioned 260 feet for the plastic ones and 490 feet for the brass variety. This is a 1,000 foot sub.
The second idea was to use oil filled gauges intended for above-water use. But these generally have considerable bubbles in the oil, are not very good at keeping the oil inside, and have other hardware not intended to live long in sea water.
Any suggestions would be most welcome!


Thanks,
Alec 


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