Ranchero 1979 GT 6.6. The car apparently has a working oil pressure gauge... but I would also like to install a new mechanical oil pressure gauge. The oil pressure sensor is on top of the engine, behind the carburetor. What thread is in that hole, is it 1/4 npt, 1/8 npt, 3/8 npt, or some NPTF? The plan would be to leave the original sensor in place and somehow branch off the output to the mechanical gauge, but I don't know what kind of oil pressure adapters I need. Maybe something like this would work for the gauge https://www.summitracing.com/parts/ATM-3224
Thanks, but what is the difference between 1/4"x 18 thread size and 1/4" NPT? Has anyone done something like this and what kind of connectors did they use?
I have seen the oil pressure sensor also mounted on the front of the engine next to the fuel pump, what thread is there? Which place is better?
Same threads in both places. Normally you see a bit higher reading in the front position, but there's not really a "better" place, just convenience.
Someone here says it would be 3/8 NPT, well that's not a problem, I'll probably need to buy an adapter then. https://www.summitracing.com/parts/sdk-c2oz-9b339-a?rrec=true OK. I was thinking that if I added an oil pressure light to my car and put a sensor next to the fuel pump. https://www.rockauto.com/en/moreinf...BrpdHbYb5/RtVyaMtxfEErmiOJDSnCPuCWx73HMK4K70= I had a damage to the "timing chain" last summer and at first I didn't realize that the oil pump wasn't turning when I tried to start the car. The car did have an oil pressure gauge, but I didn't look at it then, stupid me. If I put a sensor and a light like that, does the light go out when the engine is cranked with the starter motor, how much pressure does that switch need? If I could see the red light, I would notice it better if it stayed on when I tried to start the car.
"Someone here says it would be 3/8 NPT, well that's not a problem, I'll probably need to buy an adapter then. https://www.summitracing.com/parts/sdk-c2oz-9b339-a?rrec=true" That link clearly states that both ends of the fitting are 1/4" NPT:
I meant there Questions & Answers " Q: Scott Drake C2OZ-9B339-A - Scott Drake Oil Pressure Sending Extensions will this fit on a 351M/400 ford engine on a port located between the oil filter and fuel pump? Im looking to install a sending unit from auto meter electric oil pressure gauge. 7 years ago" A: I am replying to my own question to be of some help for others looking into installing this to their 351M/400 Ford engine. NO, this will NOT fit in your port but you can get a bushing to make it work, I had to use a brass bushing with 1/4 NPT female to a 3/8 NPT male(engine block side). 7 years ago
I don't see a pressure activation number for that switch, but I believe AutoMeter makes some in different pressure values, get one with a fairly low number. And, yes, as soon as the engine makes oil pressure (cranking) the light would go off. Also just checked a block - I was incorrect, the port by the fuel pump IS 3/8, the rear one on top is 1/4
Yes, this is a problem with many products, sellers and even manufacturers don't tell you anything about their products other than the price. Yes, I found one, it also tells the pressure value. It just has a special thread, I need to find an adapter 3/8 NPT male > 1/8 NPTF female https://www.autometer.com/pressure-switch-15-psi.html Would this pressure value be good... This is good to know because if the car won't start and the light doesn't go off when cranking it will guide your troubleshooting in the right direction. But I've learned from last summer's problems, I'll also keep an eye on the oil pressure gauge. OK.
Yup, that's the one. It's a shame that they are so expensive. But you can connect it to any light you choose, NOT just their "Pro Lite".
Yes, I thought I would connect it to the "FASTEN BELTS" spot on the dashboard at first, I don't have that light in use right now.
I bought that oil pressure sensor for the oil pressure light and the adapter 3/8 NPT male > 1/8 NPTF female and put the indicator light inside the car, the intention was to put that sensor next to the fuel pump, but the plug next to the fuel pump didn't come off (at least not with my tools), apparently it's been in place since 1979. So I finally bought this https://www.autometer.com/2-oil-press-0-100-psi-mech-sport-comp.html and a copper pipe and put a splitter on the original electronic oil pressure gauge sensor that's behind the carburetor. The needle on that mechanical gauge reacts much more sensitively than the car's own oil pressure gauge. I wasn't sure about the operation of the original gauge and that's why I put another gauge in, but the original gauge seems to work too, even though its needle is a bit "slow".
