I am replacing the idiot light and stock temp gauge in my 292 Thunderbird with Stewart Warner Gauges.   The temp gauge and sender went in with no issues.   The stock oil pressure sender is another matter.  I can't budge it with a wrench and I'm afraid I'll strip the outside of the 9/16 nut holding it in.  Anyone ever have this problem?  How do I get the thing out of the block?