#1
What I want to do is take my input from my guitar, and have two independent outputs, like one to an amp, and the other to a tuner, for example. This project is kinda like an A/B switch box, but I don't want to have to choose a signal, I want both to be on at the same time.

I have four mono and four stereo jacks lying around. How would I connect some of them so that I have one input and two outputs? I was thinking connecting the sleeve and tip from a mono input to the tips and sleeves of the stereo outputs, but I'm not sure if that would work or not.
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#3
^or just make one for like, waaaaaay less money

a passive A/B/Y, when the 'Y' option is selected, is pretty much just the sleeve of the (mono) input jack connected to the sleeve of both the (also mono) output jacks, and the tip of the input jack connected to the tips of both output jacks.

some situations might need an active a/b/y, with isolated outputs, something like this, but try out the passive way first, it might be just what you need
#4
but wouldnt that reduce his output? I mean he may not notice a difference.

I agree with James4, try the passive way first.