Help... I've finished wiring my Dakota Digital Dash in an 87 GN. Everything is working as it should, oil, water, volts, turn signals, high beam indicator, etc. However, the tach isn't working. I've tried to tap into the wiring harness that plugs into the ignition control module (nothing), I've used the lead from behind the altenator, nothing (no signal). I read on the Facebook Grand National Tech group that a tach adapter is needed for the Dakota Digital Dash, anyone else experience this? Any help is great appreciated to point me in the right direction to purchase the correct adapter needed. Thank you in advance!!