My apologies to Igor Kessel, who has a LED O2 meter and wanted to market his version. He may still be able to, for those who don't work with electronics, but I found this and just had to pass it on. http://efi332.eng.ohio-state.edu/diy_efi/projects/projects.html HTH some people, it will me. Todd Young tyoung@wamnet.com WAM!NET Inc.