Tachometer
 

I posted in the Haltech section but this may be more appropriate... Has anyone used a tach adapter, or has anyone ran the stock 85 gs tach off of the coil using a Haltech e6k and AEM coils? Or similar I should say... Just wondering if its possible and how to if so... Also will it hinder performance of the ecu/ coil if I do this?? Thanks much!