witch hose for outside fuel pressure gauge?

You can buy the Autometer SS braided hose for like $60 or a local shop that makes hydraulic hose assemblies can make it for you at a cheaper price. Ordinary low pressure hydraulic hose can be used in place of the SS braided hose, the SS braided hose just looks nice. I got mine for $4 at a place that sells industrial and military surplus parts of all kinds. The SS braided hose goes for about $3.60 a foot and the fittings are probably about $5-$8 each. You can make your own and save some $$$, the shops may have a setup or labor charge to fabricate the hose assembly.

You'll probaly want at least 5 feet of hose, 4 foot is cutting it a little close