I was reading the instructions that came with the gm 3bar, and it says to check wiring w/ a multimeter before install. so i get these results:

one wire gets a constant 5v and i get 2.83v from the map. the instructions say i should have 2.65v is there something wrong? or is this ok?

my afc2 under etc>sensor chk lists these values:
(KOEO)
pres 2.83V
thrt: 0.480~ 0.485V
(idling)
Pres: 1.0~1.1

I was planning on just splicing into the original wires and just leave one unplugged. (so i can swap back and forth when needed)

 

That is exactly how i did mine. Go to the hondata website and follow their instructions. I did that and it works fine. If i remember correctly your supose to get 0, 2.65, and 5 something from the multi meter. Check the hondata website just to be safe.