07 mustange gas gauge not working

so yesterday i replaced the fuel pump assembly in the mustang.
it's in tank all in one unit. in order to get to it you take out the back seat and squeeze back there. not a lot of room for 6'-3 guy.
start by disconnecting the power supply to it and the fuel line. sounds ez but like most new cars there are trick to that but not that hard once you watch a youtube video or 2.
so as soon as i pull the unit from the tank gas starts pouring out of the top, Luckly it spills over onto the ground below and not inside the car. My wife said what do we do? i said don't make a spark. she said really!! and i said yea don't make a spark.....
the swap from new to old unit is ez, but because it is a spring-loaded unit that has to be pushed down and at the same time installing the hold down ring that has to be turned as well is a pain in the butt.
on the 4th or 5th or 6th try i turn back to the youtube videos to see if there is a ez way to get that thing to lock in. of course all the videos i watch the skipped over that part.....
so about an hour or so later i got it to catch now i had to gently tap the ring around without making a spark.
in the end it works and now the gas gauge works as well.