Scan XL Pro with enhanced GM PIDS is as good a PC software tuning tool as the EFI Live scan tool. If you needed something for TunerCat OBDII. But it's still not a automotive tech type scan tool.

A few years ago I bought a Auto Xray 7000 and it has done anything I needed it for including OBDI, OBDII, Ford etc... lots of diagnostic ends. Been a great tool. Out dated to newer expensive version 9xxx.

But they are still available like this one $245 new and no bids. (EDIT: Sorry that says slightly used!) I think new you can find them around $300+
http://www.ebay.com/itm/AutoXray-Tec...547aa4&vxp=mtr

Been a great tool and I don't know if it has all you need for a HYdyia, but we compared it to a Snap On Scan tool couple years ago on a 2009 Chevy truck and there were no shortcomings. Except it was about $1000 less...