4.7 no oil pressure

[20dodge02]

So I bought a 2002 Dodge Ram 1500 with a 4.7. It had a broken timing chain when I got it. So I had all three timing chains replaced along with guides tensioners and oil pump now when I come to a stop my oil pressure gauge drops and checks gages light comes on. No ticking or knocking still runs great. Any ideas what the problem could be?

 

[moparman]

Oil pressure switch. Its common on any chrysler product

 

[20dodge02]

Haven't tried that yet. But the one in it looks pretty new yet