Sounds like a sound idea
I suppose I was lucky and had a speed signal available behind my stock head unit since it has speed controlled volume. Still meant I had to completely disassemble the dash and then disassemble the rest of the car to run the single wire.
I ended up soldering directly to the board instead of using that connector btw jc
Interestingly I found that when using iGuidance and the signal was lost using the Ublox GPS, the program would crash. It happened twice and they were both in areas I would usually lose signal. My only hypothesis is that iGuidance doesnt know how to handle the situation when signal is lost but directional data is still being sent so it crashes.
I tried with CoPilot after that and it did not crash and ocassionally the sat meter would go to red but I would still be moving on the map