make sure you opened the valves on the gauge after you hooked it up. if you're reading zero on both sides and you're using the gauge right then your ac is screwed(it has no refrigerant).
download the manual and go to page 903 that should help you troubleshoot
http://hondatech.info/downloads/Auto/Manuals/Civic/
Last edited by fathergoat; 05-29-2011 at 04:16 AM.