Fuel system for Nitrous

I am looking to upgrade my fuel system in preparation for the addition of nitrous.

I have a mechanical pump 110 gph and I have been told running a regulator with this pump is not necessary.

My plan is to run AN-6 from the tank to the pump, and then AN-6 from the pump to the carb.

I have noticed that many of the dual feed lines are setup for AN-8 line, I am wondering if there is a reason I should run AN-8 from the pump to the carb?

Also, being that I have never used nitrous, does the additional fuel required for the nitrous also come from the same fuel source? I know a lot of guys run a separate fuel pump but at most I will be running a 100 shot. Do I just T into the line from the pump to the carb?

Also, I am thinking it would be a wise idea to run a fuel pressure guage. I want one I can see from inside the car, not one that screws into the dual feed line where it cant be seen while driving. Can I use a mechanical guage for this? If so, would I just run a separate line off the feed line (AN-4?) to the guage?

Please idvise me since this is all new to me. If you have any suggestions or recommendations as far as what guage to buy I would like to know.

I am not too concerned with running a mechanical guage inside the car; done correctly it wouldn't leak. The reason why is so I can monitor the pressure and know that the mechanical pump can keep up.

I am only talking about a 100 shot. I haved talked to one guy who ran the kit I plan to buy (edelbrock performer) with a completely stock fuel system and pump.

I do not want to run a separate system, and I do not want to go with an electric pump. I already have a Holley mechanical 110 gph. I talked to another guy who runs this pump w/o a regualator with no problems.

I am keeping the stock fuel tank but upgrading to 3/8 line. I don't want to buy a fuel cell so a return system isn't gonna happen.

All I want to know is how to setup the fuel system so I can monitor fuel pressure and at the same time provide fuel for the nitrous.

The 100 shot will be going on my 306 with AFR 185's, custom cam, rpm intake, 650 DP etc.... it should be putting down just over 300rwhp N/A.

Right now I am running the factory pump and lines. I want to upgrade the fuel system now in preparation for the nitrous.

So you don't think it's necessary to install a guage in the car to see the fuel pressure at WOT?

I don't understand how useful a guage in the engine compartment is if it only gives me a reading at idle. Is the pressure at idle typically the same as WOT?

The only reason I want a guage in the car is so I know for sure that I have enough pressure at WOT for the nitrous and also so I can monitor the pressure when the nitrous is in use.