Using iStat Menus, where's my third fan header?

I always thought Fan 1 and 2 were my two system fan headers but when I turned my AIO pump to 100% today, I just realized that Fan 1 is actually the CPU header. Which begs the question, why is only one of my two System Headers getting reported? Is there any way to fix this? I'm using OC 0.6.4 and VirtualSMC. Let me know if you need any other info, would be happy to supply it!

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submitted by /u/gingus418
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