Im isntalling a PNP aem ems into a ford festiva and will be using a miata harness. With that being said what stock miata sensors will i need? what after market sensors will i need? I bought the GM IAT temp sensor, sr20det cam wheel and GM coolant temp sensor from DIYautotune.com, the sensors where half the price as the aem and they look the same? what additional should i buy? EGT? what map sensor should i buy?

 

The original miata sensors I used:

-Cam Angle Sensor
-Coolant Temp Sensor
-Throttle position sensor

Not miata sensors:
-GM air temp
-GM 3bar Map
-AEM wide band O2 sensor
-At one point I had a MSD speed sensor but I recently connected the factory speed sensor integrated into the gauge cluster. It works but not as well as the MSD sensor, but I don't actually use the speed sensor for anything at the moment.

For GM part numbers, I bought what is listed in the AEM sensor Wizard.

 

what is this msd speed sensor you speak of? where is this aem wizzard? thanks for the info!

 

The MSD sensor goes between the trans and the speed-o cable and outputs a hall sensor type pulsed output.

As far as the AEM wizard(s), read the excellent AEMPro user guide that is automatically downloaded when you download AEMPro. Assumning you are using a series 1 AEM EMS. I don't think they have a series 2 in a miata plugNplay yet (haven't looked). The wizards automatically setup the appropriate tables for you...i.e. you choose "GM 3-bar Map #xxxxxxxx" and it fills in the calibration table for the sensor for you, etc. So I choose the GM sensor (or whatever) that AEM already had a wizard so I didn't have to figure out the calibrations myself.