So, I can't keep the gauges that are on it now?
if you mean can you use the Ninja gages as they are, answer is yes...but as I say, you will need to pull the white/yellow wire from the conni side connector (the big one with 8 wires) that connects to the gage harness, or snip the white (I think) wire
on the Ninja gage side of the connector that mates to the existing conni one. the rest is plug and play.
you didn't mention what year Conni, if it is a pre 94, the Conni's emergency lighting (headlight)circuit will still function, just letting you know.