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I'm having some trouble with my DASH2Pro RPM readout. I know it used to work when I first fired up the MX-5 engine to test the wiring. Now the wiring is in the car the RPM doesn't work at all. The way the tacho signal comes is there is a black/white wire coming from each of the two coils which merge into one wire. Then it splits back into two, with one going to a pin on the ECU and the other to drive the tacho. When ignition 2 and the engine is running around 12v is being output on the wire to the tacho, however when I connect this to the DASH 2Pro low RPM input (yellow wire on connector B) the signal drops to around 6v and no RPM is displayed. I've even disconnected all other wires from the DASH2 so its just power and RPM. Connecting the original Mazda dash back up shows the RPM working and the tacho wire staying at 12v. Its a post 1994 1.8 MX-5 engine with a 4 pin coil.