Accuracy of aeromotive sending unit

I'm using the meter match with an aftermarket sender. The sender also read empty and had @ 8 gal. of gas left in the tank. After installing the meter match and setting it up correctly it seems to be working well. I drained the tank buy hooking an elect. pump to the sending unit and let it run till it could pull any more gas out. Then I added 1 Gal and set the empty or first point there. I then added 6 gal and set the point to between 1/4 and 1/2 on the gauge as my second point. Then added 6 gal more and set the third point to between 1/2 and 3/4. Then I filled the tank and set the forth point to where the needle read full on the gauge. So Far it has been working well on my 72 Demon with an 18 gal. tank.

Good Luck!
Tom