I just looked it up and the Taylor K-2006 is the kit we usually suggest. Take a look at the following thread.

http://www.poolforum.com/pf2/showthread.php?t=9326

You can buy a new filter pressure gauge really cheap. Pick one up somewhere. You need to know your pressure readings. I wouldn't suggest adding "as much bleach as you like." Get us some current readings and we can suggest proper amounts. But, I will say, that if it has been 3 days since you added chlorine to a green pool with a very low cya (stabilizer) reading, it isn't likely that you have any chlorine left in there. Go ahead and add one more bottle of chlorine. Keep the pump running 24/7.