Update: Tested again with a new compression tester. Still no reading. And with the manifolds on I can't reach my hand down in there to put a finger on the hole and turn the engine. Having a buddy come over to help me in a bit. Any theories on what is going on?
i don't know if you're turning the motor over by hand or rolling it with the starter. if you're just doing it by hand it likely won't register on a compression tester.
if you truly don't have compression then either the gauge or the process is messed up, or you installed the cam wrong and bent some valves.