Save your money and don't worry about fuel pressure gauge.
You want to remove the plastic cover on top (if you have not already) of engine and loosen the 14mm fuel lines at the injectors. Do you see fuel drip out when you loosen it? Does fuel come out while cranking over engine. It won't start until you get fuel out and it typically starts fueling the injector closest to the fire wall first. If no fuel then I'd start by changing all fuel lines and o-rings around the injection pump/spin on filter. Don't forget to check spin on filter housing pre-filter. I've got one in the shop now that is leaking like a sieve with most of it coming from delivery valves. Will be changing those seals along with all plastic hoses and o-rings as applicable.
If no rust I'm serious about seeing if you want to sell
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