Nice swap OP.
I'm fairly certain that most if not all GPS speedometers have an analog output, the stock 240 cluster needs an alternating current (AC) signal such as coming from an abs sensor. I get my speedometer reading from using an abs sensor then I slow down the signal and adjust it with a Dakota digital sgi-5, it's super easy to do and cheaper than most GPS units that I've seen. I like it, the signal never drops, you don't have to mount an antenna. Both ways work just letting you know.
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