trying to add a temp gauge, where in head does sender need to go its got a thing in a hole secured by a plate with wires comeing out in one head but its not all way thru just pushed into a cutout hole factory made,looks sealed, i put presure sender at bottom center where little brass plug was, would i be better off teeing the presure into the pee line and putting the temp sensor in that hole at center bottom beside the flush and pee line? thanks