Not to put anyone off watercooling but............

Put your pump on a pwm with system auto off.

Avoid tears next time.

This^

Temperature limits on cpu and gpu with auto shutdown, rpm monitoring via fan header to warn of non spinning pump and same with rad fans.

Dont rely on keeping an eye on a temp monitor.. Sods law is that it will happen when you are not at the rig.. It should be automated!
 
I've got everything working now. The fans and pump are now on a fan controller to moderate the noise and I've spent more time trying to bleed the whole system. I tested r2tw for an hour and the tubes weren't no near as hot as they were so hopefully everything is all right now.
 
Sadly it looks like you can't. But if you've a gfx block with holes top/bottom, and you're only using 2 for the current loop, use one for a liquid temp sensor.
In my loop it goes res/pump -> cpu -> gpu -> 120 rear, 240 bottom -> 360 top > res.
So I've an idea of the temp after its hitting the hottest part of the loop.

Side note, most tubing recommends no higher than 60'c and approaching close to that is extremely bad... my fluid is between 20-30'c from idle to max load.
 
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