Its 3bar, the tester hose should connect to tank and youll need new crush washers, its a simple fast test and youll know for sure, it should hold and if it falls fast theres a problem in the tank or speratic, but if good steady and strong that can be eliminated and maybe trash in an injector but the inside of tank probably good.
Check the low tension connections to the coils ( crimped tight), the vacuum hoses, and the spark plug leads. I suspect you disturbed something under the tank.
Also check the two hoses that attach to the tank. Are they crimped somewhere? Are they attached to the correct spot?