Fuel Sending Units and A-Body Fuel Tank Map

I'm about to clean out the fuel tank on a '73 Duster, and I was going to just change the whole sending unit assembly, but if it can be cleaned up, then just replacing the fuel strainer would be ok. When can I get a replacement fuel strainer?

I've looked at that Meter Match thing, and it looks nice, but 4 set points? FOUR? What is this, 1997 and Windows 95 time? There's no reason that Meter Match can't have at least 57 set points with today's computer technology, so we can geek out adding a quart of water to a tank at a time, got to get that fuel gauge TUNED! :)

I'd try tuning the thing with the fuel tank sitting flat on the ground, but the tank bottom is not perfectly flat in the car. Got to install the tank, measure the degrees of angle of the bottom of the tank at normal vehicle ride height, take the tank out, and replicate that angle on a test bench!