I recently bought a complete working set of Asteroids electronics, including monitor. The only thing wrong with them is the wiring harness is a bit hacked - about a dozen coin door wires cut and safety interlock wires removed.
I need an empty Asteroids cabinet to put these in, as right now I removed the MAME parts from my Tempest cabinet and put the Asteroids stuff in there (set on free play and working fine).
FYI - The Tempest cab will eventually be restored, it's just gonna take a while due to $$$.
http://home.comcast.net/~dark.paladin/tempest2