The iboats forum moderators are excited to announce that at this time it appears the iboats forums posting pictures function is working once again. Though we cannot promise for how long, we're hoping for indefinitely.
I use an automotive style vacuum/pressure gauge that goes to 15 psi...at speeds above idle it already reads 10 psi and over 15 psi at WOT. Idle pressure is 5 psi, this is on a 90 hp Merc two stroke OB.
If I was going to do it again I would get a marine gauge that reads 0-30 psi, this model is pretty nice and comes with all the hardware plus is backlit.