Your wiring is correct. Yes, you can leave the analog output connected. The ground doesn't matter any more, you can use any ground for the aem and the module, in fact it's best to use DB37 pin 3 for the module and any other ground for the aem.

One last dumb question (likely not the last actually).

Regarding power sources... VVT, WB02 and CAN module, do any of these need hot while cranking sources?

I can't decide how I am going to power the WB02 and the CAN Module. Which one would be best to power through the megasquirt 5amp power out? I assume that line on the db37 stays hot while cranking. I have another hot while cranking source I've got ready to use (airbag module).

You can use the white/red from the DB37 for both. The wideband doesn't pull more than 2 amps, while the module only pulls 20mA or so. The CAN module does need power during cranking or TunerStudio may throw error messages.

See, I lied about the stupid questions... Thanks a ton for the hand holding help.

Are there any other pins that the CAN Module's serial connectors that could get used in the future? I ask because I'm going to make the serial dongle tonight for the WB02 and I'll add a few extra wires/pins if there could be future things.

Nope, the serial port only carries the serial signal, nothing else.

noob question....
I just installed my ms3 basic and can module yesterday. my wideband is an LC2.
should I get a/f readings in tuner studio before I start the car? I haven't tried to start it yet. It is connected and the tps is working correctly.

I found on the other thread on this subject there are instructions for the can module. I will try again later to get this working with the instruction sheet.

I got it all working today with the instructions. Runs good already

Can the can module and the WB02 share the DB37 ground? If not, should I give the AEM it's own clean home run ground or will any old ground do?

See answer below. You can share them but I wouldn't as doing so would likely require you to use a longer than necessary ground wire for the WB02 controller. Instead, use any chassis ground for the WB02 controller and DB37 pin 3 for the CAN module.

If you have V2.2+ Basic MS3 or a V5.0+ Enhanced MS2, use pin 2 for the wideband, and pin 3 for the module.

In any other case, it's best if the module and wideband do NOT share the same ground.

The "Instructions for the MS Labs Basic MS3 ECU, V2.0+" I received did not contain a DB37 pinout. Is the Basic MS3 V2.2 DB37 pinout the same as that listed in your V3.0+ instructions with Pin 2 Device ground (Convenient ground supply for accessories) and Pin 3 Analog ground (Ground for analog sensors)?

Mostly yes. The V3.0+ units have more programmable outputs and analog inputs, but everything else is the same.

Roger that. Thanks man.

Ditto, thanks for the help on my hand holding baby questions. Sorry to ask such stupid ones but I'm really trying to go overboard on my wiring and make it modular/clean and futureproof.

I've got everything moved over to the passenger side airbag and I have a double redundant system with the idea that I have the ability to recover from a failure and soldier on with the track day no matter what happens:
1) MS3basic and Can WB02 Module
2) Stock ECU with vvtuner
3) Added circuit fuse box on switched relays with clean power
4) home run clean ground distribution box

It was a process to do the initial setup getting everything moved and now I'm going back in for the first time to redo things now that I know what I know and convert the car to can wbo2.

You're support was what made all this possible. Before I got your ms3 and accessories I had never touched a wire on any car I ever owned.

In photo, MS3, VVtuner, Can wb02, 6 circuit accessory fuse box.
https://www.miataturbo.net/attachmen...ine=1452786064

Hey Reverant, any chance of getting this to work with the PLX series gauges? I know they also use a digital serial interface to communicate with their gauges, I'd imagine it's just an issue of reading the serial output and adjusting the code to parse it. Has there been any work done on this? If not, would rigging up some kind of arduino to log a sample of the serial commands running up/down the line help you be able to code for it for this box? Thanks!

The newer V2.1 boxes theoretically support it. I haven't tested them with an actual PLX SM-AFR Gen4, only with a simulator. If you want to give them a try, go ahead.

Question about wiring. What do you recommend for the power and ground? Is it okay to use the wideband power/ground?

Edit: disregard, see an earlier post with wiring. Sounds like the module and wideband should have separate power and ground connections.

So having some trouble with the CAN module. Can anyone tell me what the LEDs indicate?

So has anyone tried updating their CAN module firmware yet? I've got one of the early boxes from 2014 and thinking about updating to firmware version V1.0.4 that I found out about thanks to Track Speed Engineering (hey Rev - your website sucks!)