NOS and FP gauge fitting on fuel rail

Hopefully this is a cheap and simple issue -

I have an Autometer FP gauge ready to install along with, among other things, a NOS Noszle setup. Both need access to the schrader valve. I have the Autometer adapter...but don't I need some sort of T or Y to feed both these things (the gauge and the nitrous)?
Shirley someone has dealt with this before...

Thanks!
Chris