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just for reference, GPS speedos can suck pretty badly at times. If you start moving and they don't have a fix, they sometimes need to stop for a few minutes to get a fix, particularly if cloudy. They also don't work very well on cloudy days, in tunnels... They are also not legal in some countries. I did 13000 miles with one as it was easier than fixing the OEM speedo at the time and I'd often have to wait for it to fix before taking off.

To answer your question, I'd have the most critical temperature, inverter or motor and battery charge state wired to the OEM temp and fuel gauges. That is what I am doing, once I figure out how to get can signals output as low side drive analog 12V. For the speedo there are various options for electric motor drives which go on the gearbox end of the speedo cable and take a can signal.
 
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