At one point in time since switching from debian to arch I had figured out the extra bits you need to get TrueRNG to work, and I didn’t write it down and subsequently forgot how to do it. After just refiguring it out I thought I’d post it here since I’ll probably forget again.
wget http://ubld.it/wp-content/uploads/2014/02/TrueRNG-Linux-udev-rules.tar.gz
tar -zxvf TrueRNG-Linux-udev-rules.tar.gz -C /etc/udev/rules.d/
*Plug in TrueRNG USB Hardware RNG* <important step sometimes overlooked
ls -l /dev/TrueRNG
pacman -Syu rng-tools
systemctl enable rngd.service
systemctl start rngd.service
sudo nano /etc/conf.d/rngd
RNGD_OPTS=”-o /dev/random -r /dev/TrueRNG”
thats the basic idea