I need help!!!!!!!

[njf5020]

I just bought glow shift gauges and I finally got the fuel pressure gauged wired right but I don't know where this psi port that faces the fire wall is. I think I have it in the Frp thing or what ever which i heard will destroy my gauge. Please help me find the right place to plug it into or tell me it's ok there my gauge also only goes up to 100 if that helps.