Oil Pressure Switch..?

Ok.. I have realized that my flickering oil light when at idle is probably due because of a faulty oil pressure switch since i have done my research on this site. So i purchased one.. checked around to where i thought it might be located under the hood but came up unsuccessful.. so my question to u guys is: WHERE IS THIS DAMN OIL PRESSURE SWITCH LOCATED? i have done numerous searches on here but cant seem to find anyone that really gives a good descriptive explanation of where it is located. Any help is appreciated. Thanks guys.

I4? On the rear of the block, facing the firewall. Best to access it from beneath the car - at least for me - since the TB, intake mani and such block access from the top.

J