Originally Posted by Mister Two

Maybe you should have a look at a SubDataScan. Little LCD screen thingy that connects to the OEM ECU via the Selectmonitor Port. Can display up to 8 sensor outputs at once. Or 4 sensors with peak hold. And it has USB output too so you can use a laptop to do logging. Only $300 too.

http://www.ecudatascan.com/s2.php