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How do you remove the oil sending unit at the back of a 400? I have tried sockets but none fit! Does it take a special tool. I am changing to a mech. guage.
If you have the guage it has a wrench place just under the bell on the bottom side. I think it's 9/16 I can't remember. I just did mine last weekend. I put a piece of steel pipe with a T fitting in the back of the block. Then I ran both the mechanical and the factory guage off of the T fitting. If it't the idiot light then it may or may not have the wrench flats on it depending on who made it. Then you are stuck with the pliers method.
It's all about being blind. Sometimes you just gotta close your eyes and feel with your fingers. Either that or just grab it with a pair of vise grips and go for broke.
Most idiot light oil sending units use a special socket. Vise grips will do it if you have room, otherwise you may need to buy/borrow that special socket.
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