I know this is an old post. but my megasquirt doesn't have the CAN.VSS, Gear EGO anywhere I can find. Is this in a different place now? I cannot get my AEM EUGO to display AFR on Tunerstudio.

I"m assuming you've got Rev's CAN box and hooked everything up, yes? Do you have the INI file for the AEM WB sensor? I recall the default setup on the CAN box supports Innovate units. You need the correct INI file for your version of the box so you can change the configuration to support AEMs.