I have an 04 GT that I just replaced both lash adjusters on cylinder 1 due to excessive tapping yesterday. When I was out driving it today and stuck in traffic the oil pressure gauge dropped all the way down then bounced back up a couple times before finally dropping and staying that way. I also noticed an increased amount of engine tap like it was low on oil. Stopped and checked the oil level and it was fine. Started it back up and pressure came back up. It did the same thing this evening. Does anyone have any idea what might be causing this? I'd assume it was the sending unit acting up if it wasn't for the extra engine noise like it was low on oil.