coolant temp sensor confusion

someone please help me!!! im goin krazy tryin to figure this out. i just swapped a b16a into my 91 teggy and my radiator fan wont kick in and the motor feels really hot while its jus sittin there idling. so im lookin up stuff an i just wanna know: coolant temp, coolant temp switch, coolant temp sender? where there locations are an am i suppos to hav an extra connector? any help would be greatly appreciated. thx