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OBD0 is, as far as I know, a nickname given to non-OBD cars on some forums.
In the distant past, a few automakers had their own plug-in diagnostic system, but each manufacturer decided if they wanted one and if so what it was going to be. And they weren't that common--and I don't think you can get the information to calculate MPG out of them very easily even if you get a car with such a system.
Soldering is required to put the MPGuino together; you buy it as a bunch of parts and assemble them yourself. Or possibly find someone who has already put one together and buy it from them. Some wiring is required, because you need to hook into power, ground, the Vehicle Speed Sensor signal, and the injector signal.
Vacuum gauges are relatively easy to mount. They will tell you an approximation of how much fuel you are currently using (as in "more fuel" or "less fuel", but no numbers). Using it for real-time driving feedback is easier than the indications of engine condition which are probably the most common instructions you would find for using them.
Don't even try to convert to OBD2, it's not worth the hassle and the money. Unless you swap in a US-spec 1996+ engine and engine management system, plus do some creative re-wiring and so on. Most people swapping later motors into early Civics will convert down so they don't have to mess with the OBD2 stuff, which tells you that the OBD2 swap is challenging even then.
-soD
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