Holley Sniper EFI

So I noticed this distributor PAC-9360-2 Pace Pac Chevy V8 Performance Red Cap Distributor has a built in cd module, could that be interferring with the holley sniper ignition setting? I have it set for neg coil ifnition input but in the holley instructions they say to use the tach out from a cd box, well I dont have a tach out on the distributor. Im beginning to wonder if i have to convert the rpm signal some how.