95 integra oil light stays on, at all time
 

i have a 95 integra LS and i threw a rod so i replaced the motor with a 97 LS motor. now my oil light stays on from the time i start it up. my old motor had an oil catch can and my new one doesnt so i was wondering if because the car was supposed to have one but doesnt now if that could be the reason? i was wondering if anyone could verify my theory? i could be wrong. thanks