Reading 13 FSR over a multiplexer
I think you mean something like this:



(I don't really understand what you need the DAC for in your schematic.)

R1//R2 create a voltage divider. The value of R1 depends on what FSR you have, and what voltage Vcc is, and what kind of ADC you used. See this link for more information.

For the MUX: The not-E pin (15) needs to be low for the MUX to work. You can select which Yn port will be connected to the Z port with the Sn inputs. So you'll need to copy the R1//R2 part of the schematic 16 times.

You could move R1 to the ADC input, like you did in your schematic. You'd save 15 resistors on the board. But the MUX has an internal resistance as well (somewhere in the 50-100 Ohm range, depending on Vcc). If that will work depends on your FSR, and what resistance it has, and what pressure levels you want to measure. It also depends on your Vcc and how much accuracy you need. E.g.: If after calculating R1 it ends up >10x larger that the internal resistance of the MUX (let's say R1 > 1k), and you don't need high precision in the lower resistance range of the FSR, it could work.

The advantage of the schematic as it is now, is that the only current through the MUX is the input impedance of your ADC, which is good for precision and stability.

If this will work correctly depends on your ADC and FSR. I can't guarantee things will work like this not knowing the specs of the other components. But I think that's something for you to figure out anyway :-).