I had similar issues and resolved them.
I had really odd behavior on my SG (in '97 Civic) for many months and finally got it handled. Before resolving it I sent it back to Linear Logic twice, they also sent me a second connecting cord to see if that helped. NOTHING that Linear Logic did helped. Though I must say they treated me extremely well. They volunteered to provide all those parts mentioned above, when I called with issues.
What helped was to install relays to power the headlights (both high and low beams) and the horn directly off the battery (via fuses of course). No kidding. Or, short term, just leave the headlights on and don't fool with them, and don't blow the horn. See if the SG behaves better.
I finally noticed two things.
1) The ScanGauge would lose its "Mode" setting. With that setting lost, it would land on some random mode setting and then show silly output. Go through your SG settings and find what "Mode" it sets itself to automatically, in normal operation. Then manually reset it to that if/when it ever messes up. Use the "Force" option to do that.
2) It would lose the "Mode" setting after I used the horn, or after I flashed my lights on and off (don't ask). So I put 2 and 2 together and figured out that SOMEHOW the significant increase in current draw was dropping the voltage available to the SG low enough (or dropped it nearly instantaneously) so that it "forgot" its mode setting.
I considered finding the 12V pin on the OBDII connector and supplying a good solid 12V to it directly. But my electrical skills being what they are, and knowing more about use of relays than I do about how to work with tiny wires in cramped quarters, I went with the relay option. Problem solved. Um, as I also know that the OBDII system is connected directly to the computer, I kinda don't want to mess with its wiring. But that's just me.
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Coast long and prosper.
Driving '00 Honda Insight, acquired Feb 2016.
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