I am installing fresh water tanks in vans that fit over the wheel well (https://agileoffroad.com/product/24-gallon-water-tank/). These tanks are rectangles with a cut-out for the wheel well. The sensor (https://kus-usa.com/product/sss-ssl-sender/) is located on the far side of the tank, past the wheel well and has plenty of room to reach full extension. There is a 'Custom Tank Shape' setting you can access while setting up the level sensor on the Touch GX. How does this work? and is it necessary to setup when using one of these tanks with a cut-out? Will the cut-out affect the sensor reading in a significant way?