I tried to put the oil sender in the usual place, (under the dizzy), but there was no hole for it. I went to the next usual place, (above the filter), what was there looked like a 1/4 inch freeze plug put in backwards in the hole. I'm not sure if I should pull that plug, it may be the cap to an oil pressure bypass. Anyone else had this problem in a 1968 327 Chevy?