Hi as usuall i found some strange problems with a car .. i scanned an 1995 pontiac trams am 350/aut win P

iv got an 52 code and this it what it tells me ::

52 Engine oil temperature was below -31� F after engine had been running for 30 minutes

BUT i cant find any sensor that messures the temperature of the engine oil !! ( there IS no sutch thing on this LT-1 Engine )

What is this ???