I have a ScanGuageII that sits on top of the dash. The user interface is rather "klunky" but the unit works very well for monitoring variables. I haven't tried any of the timing or fuel economy features.
Another option is an OBD/CAN-to-USB (or Bluetooth) adapter and a monitoring/logging program to run on a tablet or laptop. Edit: See the link to the OBD/CAN Wiki in my sig for more info on free monitoring/logging programs.
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