Here"s what the pdf I found says :
2002 4.7L
At Curb Idle Speed (MINI)
25 kPa (4 psi)
@ 3000 rpm
170 - 758 kPa (25 - 110 psi)
CAUTION:
If pressure is zero at curb idle, DO NOT run engine at 3000rpm.

And this PDF is for 2007 4.7L Ram:

 

Thank you, Site works well not a scam. I just bought it and it's the same specs than 2007 about oil pressure as I showed upper.

 

I can Resume my test pressure is not too bad isn't it ?
I have order a new oil pressure sensor before trying more expensive actions.

 

I picked up a cheap mechanical gauge at the local parts store when mine was being weird. I trust the mechanical gauges a lot more than the electrical fellers..... I think it was like 20 bucks....

 

I"m agree with you, that"s why Itested with a mechanical gauge. But it sucks when the light come on.. For holidays in July I'll go to spain with the truck so I would have free mind.It' about 800 km from here.

 

Hi guys, I installed the pressure sensor and changed the oil filter. the idle drops below 500 rpm when it is hot. but when I turned the air conditioner back on. the idle does not drop below 600 rpm. and you're fine.
Oil I use is 20w50.