I just pulled this off my 1990 1.6L track car this past weekend; I'm converting it back to stock. This was on the car for about 1100 miles.

-Megasquirt MS3x
-Braineack wiring harness (with install guide)
-Innovate LC-1 Wideband (new sensor)
-'BMW' TPS mounted on a stock Miata 1.6L plate (for easy install)
-dash light/ calibrate switch for LC-1
-GM air temp sensor
-vacuum tubing to run to intake
-3d printed airbox top to remove the AFM flapper
-I haven't looked into how to transfer my TunerStudio license to a different user yet, but if I can, you can have that as well.

This is EVERYTHING you need to go from a stock 1.6L ECU setup to being a Megasquirt-powered naturally aspirated Miata. My engine is stock, with only a cat-back exhaust. Even the downpipe and cat are factory. The tune should work great if you have a similar setup. I was able to get this to pass a CA smog test on the rollers with this tune as well. It's obviously not CA legal, but that's your business.

INSTALLATION:
-run the vacuum line from the intake to the cabin
-unplug the old ecu, plug in the new ECU and vacuum line
-remove O2 sensor, replace with LC1 sensor
-run LC1 wires into cabin, attach yellow wire to main ECU harness and black wire to small, new harness plug (wires are cut and easy to identify where they were attached)
-install dash switch. Ground one wire (steering column bolt?), and run the other to the end of the LC1 harness at the ecu. Connect it to the green wire (wires are cut and easy to identify where they were attached)
-remove factory TPS, replace with modified one.
-remove air box top.
-plug air sensor to factory plug (picture will be included), tie to bottom of airbox bottom.
-install 3d printed airbox top.

Fire it up!

I designed the airbox top - it was printed on a Dimension SST machine in 2 pieces (too large for 1 print). It was split during the build file to have a wobbly edge for more surface area to glue. It works fine. If you don't like the glued edge look, you can sand, fill, prime, and paint the box - it's ABS plastic. You can make it look as finished as you'd like.

I'm not sure how much value lies in the airbox top. It is really expensive to have that printed (~$600 at Shapeways, last time I checked), but there's nothing else on the market to compare it to.