EDIS-4 Tachometer Notes
If your tachometer was previously driven by a single coil, your tachometer will need input from two coils to indicate properly. The trick is that you need to tie all the coils together, without allowing them to ground each other. Below is a simple circuit (with Digi-Key part numbers) showing how to interface the EDIS system with your tach. The schematic shows how to do this on a 4 cylinder (two coils). Be sure to get the bands pointing the right way.
