Here is that pic of how I hooked up my tach. The green wire is led into the tach. I used one of those foldover squishy connectors and filled it with silicone before I squished it to keep the wires from rusting and stuff from the moisture..
Some people say that all Civics are wired the same and have the tach lead already inside the gauge pod (even if you don't have a tach. i.e. your STD is wired the same as the Si but just without a tach..) so you might be able to find the blue wire inside the gauge pod (should be located in the same plug that you cleaned inside the gauge pod to try to fix the dash lights) - I opted to drill a hole in the firewall, use a rubber grommet, and run a wire straight to the dizzy.
I bought a $38 Sunpro tach and although not real flashy it serves the purpose very well. Summit Racing,
www.summitracing.com has great prices on those types of products.