shift lights are universal, you can tap your tacho signal from either the ECU (EFi) or negative ignition terminal (distributor). Of course the ECU is normally cleaner.
I'm running on a carb myself and if you can run a tacho, you can run this.
Hi, I'm a serious buyer searching for a Mazda RX7 FD3S for sometime already and also quite newly registered here because I've been trying to get a FD3S, I am trying to get one that is the nearest to original state...