Concerning this gauge:
http://store.summitracing.com/partdetail.asp?part=3642

What is the fitting on the back of the gauge, is it AN or female 1/8" NPT?

 

all of them i've saw were AN, the autometer gauge i have is AN, but not the same gauge as your link.

 

Call summit and ask. That's the only way to know for sure.

 

Thanks,
So something like this would screw in to the back of the gauge?
http://store.summitracing.com/partde...=AER%2DFCM2001

This is what Autometer recommends:
http://store.summitracing.com/partde...57#largerimage

 

I used a 3Ft section for my Autometer FP gage, just make sure of the An fitting is the correct size for the fuel rail. And for the life of me I can't remenber if it was a 3 or 4 An, but had a problem getting the correct size.

 

so is the back of the gauge a female or a male fitting. i know its -4AN

 

 

That -4AN braided SS lines looks like one I used withe the Autometer FP gage. It was the -3AN one that gave the problem of not fitting. For ease of installation and mounting get the Autometer Mountinp Pod ($12.50).

 

Thing is I already got a 6' long section of -4AN line from work. It looks exactly like the one in the picture. My problem is that I have only one connector/adapter that is coming with the gauge and that is this one:
http://store.summitracing.com/partde...=AER%2DFCM2001


Basically does that line screw right onto the back of the fuel pressure gauge without any other fittings/adapters?

 

Your gauge might come with an adapter/fitting or two. Wait and see what it has.