Thanks for the reply Caltoa.
So I have not connected the spO2 to the arduino yet. But the adapter for the spO2 I have is the
http://www.cablesandsensors.com/products/nellcor-oxi-tech-extension-cable-spo2-4. I have a picture of it on my second post. I was wondering which connection is which, since I've stripped the wires, if anyone is able to help me out here. I tried looking but was unable to find anything. Basically there's 4 wires if I'm not mistaken. Colors are as follows: yellow and purple, white and green. There is also a black and red wire. Basically trying to figure which is power, ground, output, and what the other wires are for.
I will be trying to figure out which wires are which this week. Hopefully I can give you guys an update soon.