I found this tool online on their site. It says fits most systems except, GM throttle body systems. I wa slooking @ the Actron tester for GM and one of the fittings picture on the HF tool look similar. Maybe someone has used it before?

I want to tell if I am getting sufficient pressure @ my fuel rail.

Fuel Injection Pump Tester

 

The pressure range is more of a problem than the fitting.

 

http://www.ebay.com/itm/TBI-Throttle...-/260732758647

otc makes one but I think theres uses a quick release the above is a actron 0180-000-1465

You said fuel rail so is this tpi or tbi ? the tpi uses a a/n 4

 

After you buy that gauge and the adapters you might as well bought a gauge that fits without adapters. I bought the one below from ebay and it came with a ton of adapters. I have used it on tons a engines including imports, domestics, and even fuel injected boats. The gauge requires no adapters to fit the TPI fitting and has the pressure release button with 6' of hose. It also came with a pouch to hold everything.

http://www.ebay.com/itm/Actron-Profe...d4ed42&vxp=mtr

 

That's a good deal for that one This post reminded me I have a otc 7626 I should sell.