I ripped around in my off road Kick for a long time without a speedo / instrument panel and it worked fine. It just seemed to run a little rough down low, but that was about it.
Apparently the speedo sensor ( reed switch ) lets the ECU know when the motor is accelerating/ decelerating or at idle and makes small adjustments to fueling.
Putting an instrument panel back in did help it to run better though ( it developed a small hesitation down low. Felt like the engine was loading up a little
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).
I unscrewed a reed switch assembly from a Kick speedo and screwed it into a Sammy speedo for a project i was working on - too easy, all the holes etc where already there. They just hadn't been used until then. Ran a couple of wires off the switch to the ECU and hey presto - all done
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These experiments where on an early model Kick though - 92 model. I believe the later model stuff is a bit more complicated ( only what I have heard though )
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