Chuckwp Posted January 30, 2023 Report Share Posted January 30, 2023 I am starting a new thread on this even though I have seen the previous threads/posts about the oil pressure gauge hose connection to the gauge. I am working on a '51 Business Coupe using the stock instrument panel/gauges. I understand the special fitting is used to attach the rubber hose with the 3/16' tube on one end to the gauge. I am trying to determine what to do on the other end. It will be plumed into a 350 Chevy. The oil ports on that engine is 1/8" FNPT which I should be able to adapt to given the size of the fitting on the rubber hose. I have not purchased the hose yet. Does anyone know what size the female end of the hose is? From the picture it looks like it is an male inverted flare but, would like to know what size it actually is so, I can figure out how to adapt it before hand. Quote Link to comment Share on other sites More sharing options...
rallyace Posted January 31, 2023 Report Share Posted January 31, 2023 You should be able to match it up with fittings from NAPA. Our local NAPA lets me sort through that stuff and get what I need to make things work. Quote Link to comment Share on other sites More sharing options...
MarcDeSoto Posted January 31, 2023 Report Share Posted January 31, 2023 The rubber hose has nothing to do with the final connection to the gauge. The original gauge requires a 3/16 metal tube with a 3/8" nut with a bubble flare and 27 tpi pipe thread. Quote Link to comment Share on other sites More sharing options...
9 foot box Posted February 1, 2023 Report Share Posted February 1, 2023 The line coming off the oil gauge and through the firewall has a short rubber line for vibration and engine flexing. You can buy 8” or 12” brake line that I would attach to the rear engine oil pressure port, and attach the other end to the hose. That keeps the fittings inverted flare and close to the firewall. I would buy eBay part # 173602620307 hose. That’s all you need for an oil gauge connection, not all that hose pictured. Inverted flare to 1/8” pipe to 1/8” to 1/4” pipe adapter. I just bought that hose for a build I’m working on. Rick D. 1 Quote Link to comment Share on other sites More sharing options...
desoto1939 Posted February 1, 2023 Report Share Posted February 1, 2023 but you still need to use the special fitting to connect to the back of the oil gage unit. which has the 3/8 nut and the 27 pitch threaded bras fitting. Rich Hartung Quote Link to comment Share on other sites More sharing options...
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