Right now im running:
Aem FPR
Aem Fuel rail
Walbro 255hp intank
OEM filter

I want to get rid of the oem filter, can i just get an aftermarket aeromotive or something? and also how can i attach a gauge to the fuel rail??

 

You can run the aeromotive filter if you have braided lines to the tank. Or convert the hard feed line to a braided line with a clamp and go from there.
AEM does make a filter that mount's in the stock location and uses the stock lines and fittings.
The aem rail only has one port so if you are running the stock mounted FPR then you cant mount the gauge on the rail unless you drill and tap it.
You can get an -an in-line fitting to go right before the rail that you can screw the gauge into so you can see the pressure.

 

Get a aem fuel filter. You can get a FPR that doesn't mount on the fuel rail and put the guage where the fpr was or put a guage on top of the fuel filter. Take the screw out of the top of the fuel filter and buy a gauge that takes it's place. I had mine like that for 2 years. Now i have all braided lines.

 

I ran an aeromotive...cut the line from the tank to the filter, flared it, used a flare fitting and then ran a braided line to the filter...pretty simple