No oil pressure at idle

So I ordered a Melling high volume pump. Almost thinking it’s a counterfeit. Ordered on eBay, the casting on the cover looks tougher than those I’ve seen pictured, and there were visible machining marks inside. It was a PITA to install in the car but I got it. The reward is evidenced below. Hopefully I didn’t do too much damage during the time it was operating with low pressure.