AEM has no RPM input, and I couldn't find any loggers to use to capture the serial out data.
Most people logging with the AEM seem to be from the nismo/Mitsubishi crowd as they all use EvoScan.
The only other solution I can think of is to get ME7L to read data from the AEM through another com port. Unfortunately, this requires the source code to ME7L.
Yay! another win for closed source abandonware :/