What is the thread size to the oil pressure sender

[panelbilly]

I want to add a fuel pump cut off to the 3.0 that is going into my car. The CIS is being replaced with PMO carbs. I was thinking of adding a T fitting and the shut off. The engine is in the shop being reborn, so I don't have the old sender

[db_cooper]

Pretty sure it is 10mm x 1.00

[Ayles]

So the idea here is that the if the oil pressure drops you can kill the fuel pump? I am a little unclear as to what the oil pressure sender has to do with the fuel pump.

[panelbilly]

The idea is if oil pressure drops, the fuel pump turns off. I'm thinking of add a T fitting at the oil sender for the cut off sensor

[Ronnie's.930]

Originally Posted by panelbilly

The idea is if oil pressure drops, the fuel pump turns off. I'm thinking of add a T fitting at the oil sender for the cut off sensor

Depending on how you are using the car, or where you are at the time of fuel pump cut-off, you might end up with bigger problems than a damaged engine from low oil pressure (for example, in the middle of a 100+mph turn on a racetrack, or booking down a bumper to bumper, eight lane highway). . .

[panelbilly]

I'm thinking of an accident and I don't want fuel pumping all over the ground

[Ronnie's.930]

^^^ Then you might consider using an inertia switch between the fuel pump and its power source - would be much simpler, and safer, than the low oil pressure switch idea.

[Ayles]

I was looking in to this exact thing a while back.

https://www.pegasusautoracing.com/productdetails.asp?RecID=87

Since you are in Seattle, pm me. I would like to hear more about your project. Sounds like we might be at a similar stage.