Well this is true. But the scan gauge does a few other things I like as well. Plus I already have a three gauge pod with oil press. and tranny temp. I guess its 6, 1/2 dozen. The ScanGauge is a bit cheaper than the Aeroforce, but you can gang three Aeroforce gauges together. I also like having a dedicated gauge to the oil and tranny.
So I dunno, I guess you could go round and round depending on what you want or are looking for.