MPGuino for a 1990 CRX HF
 

Can anyone help me with a MPGuino. I dont really know what it is but i am pretty handy with electronics. Could you tell me what i need, how much it will cost/where to get it, and got any easy to follow diagrams to install it?

This link should tell you most everything you need to know to get started.
MPGuino - EcoModder

Someone also just recently made it into a compact kit form.
http://spiffie.org/kits/mpguino/start.shtml

I made one using the original Arduino board, and a green LCD. Mine works great.

As far as I know you need to get an electronic vss, the crx uses a cable driven one, put the vss's from later civics use an electronic one and it can be put on, but I believe you need an updated dash gauge assembly...

not too sure how it all works

is there a CRX specific guide that anyone knows of with pictures or something because i only have vague experience with wiring ANYTHING up.

I should get off my butt and make one. Just find some crx ecu pinouts and track down the right pins. I'm pretty sure I have ecu pinouts up on crxmpg.com

Looking through the CRX manual it is cable driven but there is a speed pulser on the back of the gauge panel that outputs 4 pulses/cable rev. So that should work for VSS, haven't looked into if it goes to the ECU or not (would work either way just easier wiring.) For cars with optional cruise control doesn't it have to have an electronic speed signal somewhere? Any car that has an electric analog gash which I think most do should have a way to tap into the speedo somehow.

I just spent an unknown amount of time putting together my new MPGuino (excited) Ordered from spiffie V2
You'll need a soldering iron, solder, and side cutters and a multimiter probably. You'll also need soldering skills or bravery or a friend who does. It's not actually that hard but I've been doing it on rare occasion for quite some time. Usually just wiring in a car for stereo or aftermarket ECU or similar. Not too often with actual circuit boards. But it actually is a pretty basic skill if you have good fine motor control and aren't shakey.

Anyway, I've also got a 1990 CRX manual so I should be able to figure out the settings. I think I have the Vss figured out and the microsecond/gallon shouldn't be too hard with some math and looking up the injector size. I haven't hooked up to the wires in the car yet (1989 Civic Si d16a6) but should have that accomplished as well as some testing this weekend. So, I should be able to at least give ballpark figures for the settings. I also keep track of my tank mileage already so I can compare results and have a good idea of my average mpg.

id be interested in this