The other two are kind of redundant. Just get a new OPSU for the stock gauge, and confirm with consult that your temps are ok for a while after you get it running. After you confirm that you are running a good temp under all circumstances, you can use the stock gauge to tell you if you develop a problem. Then they will all fit in the 300* pod.
"the truth hurts like a big black cell mate and no vaseline" - BigTDogg (MA) "John McCain has already tapped me..." - Sarah Palin (Said during VP debate)