9.9 4 stroke intake fuel pressure (suction) question

[SouthernSailor]

I have a couple of 9.9HP 4 strokes. Each is fed gas through a racor filter/water separator.

I would like to install a suction gauge on the output of each filter so that I know when the filters need to be changed.

Question is:

1) What range of gauge should I use. Is 0 to 200 psi appropriate? If not, what suction pressure would I typically see from a Yamaha outboard fuel pump for a 9.9 4 stroke?

Thanks folks.