Ebuild, manifest and patch to allow installation of Dan Amlund Thomsen's lm-sensors plugin for lxpanel on Funtoo/Gentoo.
Here is his git for it: https://github.com/danamlund/sensors-lxpanel-plugin (ebuild d/l's source automatically from his web page).
I was missing the fan speed from my now discarded Gnome panel, thanks to Mr. Thomsen I now am missing only the bloat.
Nothing special you really need to do except set up a custom local portage directory if you haven't already, see for example http://www.gentoo-wiki.info/HOWTO_Installing_3rd_Party_Ebuilds
I suggest using a directory called lxde-base/sensors-lxpanel-plugin to match main portage tree. Place the sensors-lxpanel-plugin-1.x.ebuild and Manifest in that directory. Make a files directory in that directory also and place the distdir.patch in the files directory. Note: This ebuild & plugin should work fine with amd64 but I have not personally tested that, as I have no 64 bit hardware here. Let us know if it works for you!
Roughly the following per Mr. Thomsen: lxpanel glib2.x gtk+-2.x libsensors.so.4 (worked fine with my lm_sensors-3.3.3-r2) menu-cache
emerge -av sensors-lxpanel-plugin