If you're tuning for max power or just trying to keep your old buggy on the road, this tester can give you a quick look at fuel pressure. It attaches to the 944's fuel rail test port just like the Porsche tool P 378 or VW 1318.

This fuel pump tester includes a simple gauge, hose and the needed fittings to attach to your 944 or 928.  This particular gauge has the needed pressure range for testing all Porsche fuel system and comes with a blow-molded case and hose. It also has a drain hose and jumper wire for pump capacity testing or for emptying the fuel tank.

Note: More info on using the gauge is available here.