Most AP stores have one for about 40 bucks that fits the schrader valve on the fuel rail. My valve is the smaller one and the gauge I bought has an adapter for it. If you have the return type fuel system you can check the regulator too. The pressure should be about 30-32 psi and when you kill the vacuum to the regulator it should jump to 40. Easy way to kill the vacuum is to pull the vacuum line out of the upper intake and plug the hole real fast.
