bigmacks

i have an ls/vtec in my del sol. my vtec is not working i have 2 oil pressure gauges in my car one at the back of the block and one at the vtec test port at the front of the head. block oil pressure is normal at 10-15psi at idle to 80 at high revs, i do have the full psi at the end of the ls/vtec line but not at the other side of the head only getting less then 15. solenoid is clean and clicks and activates at 5000rpm like my computer is chipped to do. it turns my engine light on if i drive in vtec for a short period of time throws a code 22 but i have tried 3 different vtec pressure sensors and that is not it, it is definetly oil pressure problem. i even switched where the line taps into the head to the 1/8 hole . any advice would be helpful.........