What do I need to do if my oil pump isn't pumping after timing chain replacement on 2002 Chevrolet Trailblazer

Runs but sounds like it needs oil

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3 answers 2 comments
CHECK OIL PRESS. WITH TEST GUAGE. WHO REPLACED CHAIN AND WHAT ELSE WAS REPLACED? COMPONET KIT?
All gears and tensioner
HAD ONE IN SHOP CUSTOMER SAID NO OIL PRESS. TURNS OUT THE
GUAGE WAS DEFECT. THAT IS WHY I SAY HAVE PRESS. CHECKED WITH
MAN. TEST GUAGE. THE NOISE COULD BE PROBLEM WITH PARTS INSTALLED.
SEEK HELP FROM HERE ON SOMETHING MAY BE WRONG IF YOU DIDN'T HAVE THIS ISSUE B4
Looked up on-line parts info- shows both a 'primary' chain and a 'balance shaft' chain and tensioner ?? if so were both replaced? did you do it yourself , or a shop? If yourself , was there tension on the chain(s) after assembly -Looks like they are hydraulically operated =no sealant or gasket between the tensioner and block, may obstruct oil flow? Just thoughts not especially familiar with that engine.