Hi tyler,
Actually, a good guide on connecting SEL would be to reference the EVB schematic on page 3 of the datasheet.
If you refer to the highlighted area in the screenshot, SEL is actually pulled high using VCC and a 20.5Kohm series resistor. So tying the pin to Vcc shouldn’t be a problem. I’d also guess 4V is the minimum to pull SEL HIGH.
Cindy