I have the same swap in my crx. It's an easy swap to do. You pull the motor and put the stock harness on the motor. You'll have to visit the Hybrid pages (
http://hybrid2.honda-perf.org/tech/4gdxtozc.html ) to get the wiring for the Multi point fuel injection to make it work in your crx, but otherwise it's real straightforward. I would try to get your hands on a CRX Si trans, as the gear ratios are better, but it really doesn't matter that your old car was an automatic. Just bolt the manual trans up to the motor. Same with the speedo cable, just plug the stock speedo cable into the trans and you'll be good to go. The only real thing that you'll need to change will be the injectors. You'll need a set of OBD0 injectors from a 1988-91 Civic/CRX Si, or out of a 90-91 Integra. They are peak and hold injectors, wherease the ones from 92-up are saturated injectors, and won't work right with your obd, unless, of course, you run the obd conversion harness noted below...
Also, you don't need the P28 ECU, although it would be nice to use it for the vtec engagement. If you want to use it, however, you'll have to get a wiring harness like this one (
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...7915859793&rd=1 ) or else become a wiring genius and wire up OBD1 by yourself, which is a HUGE job. So, what I recommend is just to simply get yourself some sort of vtec controller and use that to activate your vtec. I know that it won't change your timing like the P28 would, but you don't have to mess with running your car on OBD1, which is a serious pain in the butt, since the car is an OBD0 by nature. I really like my Z6 swap, and have found that it's a peppy ride in my CRX. Feel free to email me at
josh@wiredspeed.com if you have any other questions. I have done this same swap a dozen times, so I should be able to answer any questions you have. Good luck!