scott_53 Posted June 24, 2015 Report Posted June 24, 2015 Does anyone know what the thread size is on the back of the oil pressure gauge, where the oil tube connects? It's a 48 Dodge. Appears to be a stock gauge. I'm planning to use a t fitting to connect a oil pressure switch (PS64) back there. Then use that switch to wire in a electric fuel pump. I found some very helpful info on this site on this topic (thanks for that), but I'm just stuck on the thread size. The 1/8 t fitting I have fits the switch alright, but 1/8 is to big to fit into the guage, or the oil tube that feeds the gauge. Same issure under the hood. 1/16 NPT maybe? Thanks Scott Quote
Jerry Roberts Posted June 24, 2015 Report Posted June 24, 2015 You do know that the oil line is made to seal not by the threads , but by the very special brass fitting ? 1 Quote
Niel Hoback Posted June 24, 2015 Report Posted June 24, 2015 Tap into one of the oil gallery plugs on the side of the engine. 1/8" pipe thread down to pressure gauge line size should be standard plumbing fittings. The switch would be near the block also. Quote
scott_53 Posted June 24, 2015 Author Report Posted June 24, 2015 I didn't know that about those fittings. I can do that, tap in on the side of the engine...heat wouldn't be a problem?...that's why I was thinking of putting it up at the oil pressure gauge. Thanks guys! Quote
scott_53 Posted June 25, 2015 Author Report Posted June 25, 2015 What are those special brass fittings called? Quote
Jerry Roberts Posted June 25, 2015 Report Posted June 25, 2015 Heat would not be a problem , just as heat isn't a problem for your oil pressure gauge . The fittings that are existing on the side of the block is the answer . Quote
Dodgeb4ya Posted June 25, 2015 Report Posted June 25, 2015 What are those special brass fittings called? "Unavailable Fitting" ! Quote
Young Ed Posted June 25, 2015 Report Posted June 25, 2015 "Unavailable Fitting" ! They are not unavailable. I bought a few of them about 2 years ago from my local hardware store. I believe they were gas fittings for water heaters. They are one piece and the first time you tighten them that little end piece breaks off and clamps on the line. Quote
scott_53 Posted June 26, 2015 Author Report Posted June 26, 2015 Thanks. I wonder if they are AN fittings, not the NPT pipe thread type fittings I thought they were. I'm gonna take a closer look this afternoon Another question...... I replaced the mechanical fuel pump with and electric pump because the mechanical pump failed on me a few weeks ago. Not 100% sure if it was just a mechanical failure of the pump or a vapor lock issue. Hot day, there was no head shield on the mechanical pump. The car did cool off for a good 1/2 hour, and still, no go. Either way, I decided to go electric, mounting it back near the gas tank. Question I have is with all the issues I hear about vapor lock, should I be heat shielding the fuel line under the hood in some way? Or does the change to electric fuel pump eleminate any vapor lock problems? Appreciate any thoughts you gus have. Just as an aside. We were stuck with this fuell pump problem 100 miles from home, on our way to my wifes daughters wedding which was another 50 miles away. My wife was.....well.....stressed. Just as she started writing FOR SALE...CHEAP in lipstick on the back window, a young man pulled over to help us. He diagnosed the problem..took me to a NAPA store...stopped home to pick up some tools....and installed that electric pump by passing the mechanical one. Then followed us for a bit as we drove away. We got to the wedding. Nope, he wouldn't take a dime. Although I did stuff my emergency C-note and my wifes thank you note into his tool bag when he wasn't looking. He saved the day. Quote
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