Last year it was claimed an add-on tachometer required the ignition signal. I said the CANbus signal could also be used with Speedhut tachometers; speedhut.com/gauges/Tachometers/Freedom-CAN-Bus-(OBDII)-Gauges/?catid=f232|f9|f215
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NO wires will be cut. This is wiring harness plug-in to the BlueDash/MGMP connector.
Are you willing to share the details of your setup ?
As you only have one unit to sell, and there are likely more than one of us interested ?