[39chevy]

Where is the best place to install my Temp Probe, in the (Pet****) ? If so where my wing nut is attached to my Rad when it screws up against the attached nut, can I put a wrench on that nut to unloosen it, and which way should it turn (seems pretty tight) I don't want to snap anything off? Also are all the threads the same for my adaptor to screw in,, which I haven't bought yet? Who has the fittings to fix this so it works the way it should? I got the adj. switch on a bardering thing, Advise, thanks, Dana