Deacon

Im doing this for myself as well as others later on who may install MSPnP2 in their Turbo or NA Miata. This is going to hopefully be a little write up of my MEGAsquirt install on my 1995 Miata. Sorry if this is been covered before but I have had a hard time finding the correct wiring diagrams as well as info so figure I would try and be helpful and post photos, diagrams, etc. as I go through my harness. Any info, facts, advice, etc would be greatly appreciated!

I do understand this is a basic install being "plug n play" and that DIY Auto Tune DIY AUTO TUNE MSPnP2 Miata Install Guide has a write up but I want to cover it a little more in depth to better myself with this setup as well as anyone else who is not the greatest with wiring such as myself.

Deacon

First off I am halfway through my harness as far as removing unnecessary wiring and plugs from the harness to clean my bay up as well as make it easier to diagnose problems later on down the road.

As of now I am working on routing the MAF wiring to the passenger side of the harness and wiring in the GM IAT sensor for the ECU.

From what is listed on the DIY Auto Tune write up we need to wire our GM IAT sensor to #3 and #4 wire in the photo posted. It does not matter what way you wire it to the sensor as there is no polarity in IAT sensors. You can run a wire to your sensor or pull the entire harness like I have and reroute the wiring from the driver side of the harness over to the passenger side to clean it up and make it look nicer.