ianmayco68 Posted September 13, 2016 Share Posted September 13, 2016 Hi all , does anyone know the size of the thread on the back of the above gauge ? I brought the gauge off ebay and its in very good nick and then I brought a VDO boost gauge fitting kit but all the fittings in the kit are too small can anyone help ? cheers Ian Quote Link to comment Share on other sites More sharing options...
AgedMechanic Posted September 13, 2016 Share Posted September 13, 2016 A web search seems to suggest 1/8-27 NPT but I can't guarantee it. Check the actual model you have here https://www.vdo-gauges.com/instruments-displays-and-clusters.html. Dave Quote Link to comment Share on other sites More sharing options...
ianmayco68 Posted September 15, 2016 Author Share Posted September 15, 2016 Cheers Dave, its a vision one and you seemed to be right on the thread size. I brought a gen vdo fitting kit but all the adapters are to small so will have to source one from somewhere. cheers Ian Quote Link to comment Share on other sites More sharing options...
ianmayco68 Posted September 17, 2016 Author Share Posted September 17, 2016 got the part number of my gauge 150 015 001 and it doesn't match anything on there site so will contact them see if they can help . Quote Link to comment Share on other sites More sharing options...
Ex Member Posted September 17, 2016 Share Posted September 17, 2016 https://vdo-webshop.nl/en/pressure-gauges/1204-vdo-cockpit-international-pressure-gauge-0-tot-3bar-52mm.html Says M12x1.5 Quote Link to comment Share on other sites More sharing options...
ianmayco68 Posted September 17, 2016 Author Share Posted September 17, 2016 Cheers Red90 looked on the vdo web site above and wasn't listed put the number in a web search and got American sites but no info about fitting size. cheers Ian Quote Link to comment Share on other sites More sharing options...
matfield Posted September 18, 2016 Share Posted September 18, 2016 It depends if you have a PSI or BAR gauge, the fittings are different. The BAR gauge is M12x1.5 and the PSI one is 1/8NPT 27tpi as far as I can remember, but I can check them outside tomorrow. Quote Link to comment Share on other sites More sharing options...
ianmayco68 Posted September 18, 2016 Author Share Posted September 18, 2016 cheers matfield I've got the bar gauge so its m12x1.5 . cheers Ian Quote Link to comment Share on other sites More sharing options...
matfield Posted September 18, 2016 Share Posted September 18, 2016 Did your gauge not come with a little copper tube an olive and a brass 'nut' to attach to the back of the gauge? Mine came with these, and 6mm nylon tubing fits over the copper tube, and the olive seals it shut against the back of the 'nut' Mat Quote Link to comment Share on other sites More sharing options...
ianmayco68 Posted September 18, 2016 Author Share Posted September 18, 2016 No unfortunately it was a bargain off ebay and these bits were missing> Quote Link to comment Share on other sites More sharing options...
Peaklander Posted May 2, 2019 Share Posted May 2, 2019 Just raising this thread for some advice please Ian. I too bought a VDO boost gauge (just before Ian put one up for sale!) and I can't get the pipe to hold in the fitting at the back. I have the insert tube that is a good fit into 6mm O/D tube, the little olive that's a good fit over it, and the union. I have tightened but the union won't bite. Do I just need to put some more effort into it? As it's a gauge I am probably being a bit too careful. I presume that I have to deform the olive enough and I probably aren't... Thanks Quote Link to comment Share on other sites More sharing options...
Ex Member Posted May 2, 2019 Share Posted May 2, 2019 It is probably supposed to be 1/4" tube and not 6 mm. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted May 3, 2019 Share Posted May 3, 2019 Ah so just a little bigger. That's frustrating. Quote Link to comment Share on other sites More sharing options...
ianmayco68 Posted May 3, 2019 Author Share Posted May 3, 2019 Hi Peaklander, I didn’t have the fittings you have and ended up making something up myself , a fitting off eBay and a cable tie to secure it on , I looked for a Vdo fitting kit but no one sold them separately that I could find so sorry I can’t help, but if I’m reading your problem rite you might need just a bit more force , if each of the parts are quite snug fitting when you try and tighten it up the olive will dig in the rubber tube I would imagine and need a bit of effort to get it to squash down the tube . Quote Link to comment Share on other sites More sharing options...
Peaklander Posted May 3, 2019 Share Posted May 3, 2019 I have been distracted by a day of turf laying for daughter #1 today. It's better than the two sessions of serious sewer unblocking at daughter number #2 earlier in the week. When I say serious I mean it! So it's back on the main job tomorrow and I will try a bit more force Ian and if that doesn't work then I'll take Red90's advice and go up to imperial. Thanks both. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted May 3, 2019 Share Posted May 3, 2019 The VDO tubing kit is part number 150-851. Cheap and not hard to find. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted May 8, 2019 Share Posted May 8, 2019 It is 6mm and not 1/4". I tried a piece of 1/4" and the olive won't fit over it. So I tried harder with 6mm and it is tight now. There are a couple of flats for an 8mm open ender on the gauge so it's actually easy enough to tighten the union and squeeze the olive. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted May 8, 2019 Share Posted May 8, 2019 The problem is you will have crushed the olive already. Olives are a single use item. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted May 8, 2019 Share Posted May 8, 2019 Yes I’m aware of olives but I didn’t try at all hard to crush it. It may be 6mm or a 1/4”. If a 1/4” then the “no crush” insert for the pipe is not very tight. We will see. Quote Link to comment Share on other sites More sharing options...
Ex Member Posted May 9, 2019 Share Posted May 9, 2019 Okay. I didn't understand your original issue then. The olive must be deformed to seal. That is how it works. Quote Link to comment Share on other sites More sharing options...
Peaklander Posted May 9, 2019 Share Posted May 9, 2019 😀 Thanks. I didn't notice the flats on the gauge connection the first time and so I didn't apply enough effort to squeeze the olive, expecting magic instead. I'm pretty sure it's OK now and I have secured the Mud console to the dash now. Soon be driving again. Quote Link to comment Share on other sites More sharing options...
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