trying to add a sensor to turn my electric fans on, cant get this plug to come out what is the right tool to remove it, no allen wrenches fit it metric or standard, it almost looks like it's a square fitting, what else can be used, or can I relocate the sensor to a T fitting and use the drivers side hole where the temp sensor is. I have tpi so there no place to stick it in the manifold and my radiator has no fittings either ...... gimme some idea's guys

 

Try the end of a standard ratchet or extension. They usually fit pretty well.

 

vader

tried that but its a little smaller than a 3/8 th's ratchet

 

i have a set of pipe plug sockets from snap on, don't recall all the sizes, but look into gettting a 5/16" or so sized one if 3/8ths doesn't work.