Everything Flickering

i just put in a brand new alternator and battery on my 00 civic ex, and now all the lights flicker, and when i take my rpms up to like 5000 my rpm needle starts bouncing everywhere and all the lights start flickering even worse. i got my alternator and my battery tested at autozone and they said everything is working fine, so i was just wondering if anyone knows what the problem might be. i also put new terminals on the battery and a new ground wire.

look at the alternator and make sure the connetion is good, the plug and the wire that is bolted down. make sure hte belt is on good too

check the ground wire off the alternator, maybe you forgot to put it back on.