Hello Erick,
Don't start replacing expensive parts until you find the cause of your problem. Take a hot wire and activate the starting solenoid for a few seconds while someone cranks the engine. If it starts, you most likely have a fuel delivery problem. Something clogged or a bad elec. fuel pump. Make sure you hear the elec. fuel pump running when the ignition is on.
You can go to the hardware store and just buy a reg pressure gauge (for water) it will work fine. Try to find a gauge which does not go too high so you can read the small pressures easily. Next go to the auto parts store and buy 36" of low pressure 5/16 " fuel line. and two small hose clamps. Check to see if you need to add a fitting on the pressure gauge so you will be able to clamp the fuel hose to it. I like to clamp the other end to the end of the metal fuel line going to the intake solenoid.