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The illustration MSD provided (above), shows the adapter wired in series to a single coil. But, our VDO tach can’t read the signal from just one cylinder and accurately interpret it to display engine speed for all eight, so we needed to wire the adapter into the wire that feeds all eight coils. In the case of our Crown Victoria, we cut this wire (circuit 34 coming out of connecter 1026) just before the splice where system voltage branches out to each coil. Power then goes into the adapter’s red wire, through the adapter, and out to the car’s ignition system via the red/green wire.