3/8 vs 5/16 fuel lines

I added a fuel pressure guage right before my carb, after my filter... screwed directly into the metal edelbrock single feed line... I think it cost like 10-15 bucks for the guage? Now I know my fuel pressure and its an easy way to monitor it... and my problem ended up not even being fuel related lol.... I also rarely ever check it :eek:

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