Looking at the back side of the above-suggested device from Amazon:
http://www.amazon.com/Simvalley%2599-EL ... 558&sr=1-4
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I see that the circuit board is not one of the two that I have had the
most experience using. Even with these pictures, you might order
and get something else, but I do not know. It might be great.
In my somewhat limited experience, it is difficult to tell.
Perhaps ask the seller.
The description says firmware 1.5, but difficult to tell.
There might even be several different 1.5 versions.
The 2.1 is software (for the PC?)
presumably supplied on the CD, which we do not use.
If you provide your location, city and state, in your profile,
it would be easier to suggest help for you.
GIDs come from the EV bus, and have not been discovered
on the CAR bus. They seem to be the best "fuel" gauge that
we have. The SOC is only an estimate of "tank fullness",
whereas GIDs estimate the amount of fuel in the tank.
Of course, these would be closely related if the "tank"
did not change capacity, and even gradually shrink
For any ELM327-type clone device:
Test it with the LEAF Battery App and the CAR bus.
If it appears to work consistantly, pairing easily, and
maintaining a solid connection, then...
Get somebdy (usually local to you) to modify it
I do not yet have a good solution for adding the slide
switch, but the EV modification is easy to do on these
"stubby" (not the mini, or the short) cases.
Possible modification suggestion:
If you want to buy two of these, and have them both shipped
to me, I will test them both, and notify one for EV instead
of CAR bus, test it again, and send the modified one to
you (in the USA?), keeping the other for my growing
collection of different types.