Im having problems with my toyo 91 motor 3.0 because I can't find out how to check the fuel pump pression, I couldn't find the location to hook up the fuel pump tester, if anybody knows where is located the exact place to hook up the fuel pump tester Thanks

Use the bolt at the cold start injector. You'll have to have the proper fuel line connection to do this, though.
Generally, if you crack that 12mm loose (just slightly) then bump the starter briefly, and get a heavy amount of spray, the fuel pump is OK.
But please do this safely.