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Old 29 April 2010, 17:20   #1
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DIY digital presssure guage

Hi Guys,

Thought I would post an idea I came up with last night whilst trying to cobble up an accurate way of measuring air pressure within my tubes. I have posted it in here as this is where I have received the most help.
This particular way is for a boat with A7 valves.
I am sure there will be a few variations on this, and others may know of a more accurate way of checking pressure, but this is mine.

Picture one; What you will need. Grips, Spanner, LCD tyre pressure guage, 15mm compression straight, PTFE Tape (optional, but I like using it), a Schrader valve and an A7 valve deflator attachment.
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Old 29 April 2010, 17:21   #2
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Picture one; The deflation attachment. This fits A7 valves, and is the same as an iflation valve, but with a spring to depress the valve plunger. I got it from here... http://www.polymarine.com/products/p...%5B1991%5D.cfm 4.99

Picture two; Schrader valve. I got this from here... http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT 1.50
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Old 29 April 2010, 17:22   #3
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Picture one; Take the compression nut off the straight connector and slide it over the Schrader valve. You can discard the olive for this side of the connector.

Picture two; Tighten compression nut onto straight. This requires very little pressure, I did mine little more than finger tight.

Picture three; PTFE tape second olive. This is optional, but I like to do it. Hold the olive between thumb and finger and wrap around it a few times.

Picture four; Olive wrapped with PTFE, ready to go together.
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Old 29 April 2010, 17:24   #4
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Picture one; Put the compression nut over the outlet of the deflate adaptor...

Picture two; ...followed by the olive.

Picture three; Tighten the connector onto the deflate adaptor using the spanner and grips. Try to keep the fitting as close to the deflate adaptors shoulder as possible.
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Old 29 April 2010, 17:26   #5
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Picture one; The finished article.

Picture two; Rady to use with an LCD tyre pressure guage. My one shows bar or PSI to one decimal place.

Insert the adaptor into your valve, remove the Schrader cap and measure!
Hope you like this. If you can think of improvements, please post.
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Old 29 April 2010, 17:31   #6
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Why wrap the olive with thread tape?
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Old 29 April 2010, 17:52   #7
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I just like to, one of my quirks. I have never had a joint leak after doing this.
But as I said, its optional.
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Old 29 April 2010, 17:52   #8
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Quote:
Originally Posted by chewy View Post
Why wrap the olive with thread tape?
Coz hes a gas engineer,,
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Old 29 April 2010, 17:56   #9
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Quote:
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Coz hes a gas engineer,,
Enlighten me.
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Old 29 April 2010, 18:00   #10
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Enlighten me.
He will have boxes of the stuff !,,lol,,i think its a good idea though ,,saves him kicking the tubes ,
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