sounds like one is the switch for an idiot lite, with closure to grd
and the other a resistance unit for a gauge or the two terminal could
also be a switch but isolated from grd. this would be used to start
the hr meter once oil pressure is established. if u had some way to
pressure check them and measure the terminals resistance to case of to
each others, it would answer the question. otherwise, see if u can
google the p/n's or maybe take them by an autoparts store see if then
can identify the function of each by the p/n's.