Nope. Perfectly normal. Repair Manual gives specs of 7-35 psi range. Evo doesn't need oil pressure so much as oil presence. Only the tappets rely on high pressure, and the passages up the pushrods, into and through the rocker shafts. That's it....
Mine runs 23 highway (hot) and 15 idle. On really HOT days, I'll see 18 highway and 8-9 at idle.
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012
2005 E.G. Classic
Baisley Oil spring
Rinehart 3.5" pipes
S&S adj pushrods
3 stickers, adding 5 hp each. I swear......