This is how I installed my Autometer sender inside my Mini
tank with the stock sender plate.
I cut off the old sender that read in reverse with the new
gauge.
I drilled a hole in the plate and mounted the supplied bracket bent
at 45 degrees.
I mounted the sender to the bracket and placed it in the
tank. Make sure you use the rubber gasket on the outside though to avoid
leaks.
Aligned up the tab and marked the tank and sender for reference.
Then adjust the sender to to get the best reading.
On first fill, pour each gallon in one at a time and write down your
gauge results. I currently have mine set to read E with one gallon left. It
hits F about 2 gallons before toped off.
You will notice that I have some kind of goop on my on the inside on the back
plate, this is gas tank sealer. I don't know if this was necessary, but used it
anyway.