The tacho is just looking for a -12v pulse per engine revolution. Can't think what adding a resistor would do, unless the tacho required a lower input voltage or the EMU requires a pull-up resistor. Mind you if you also added a capacitor then you have a basic low pass filter for smoothing out noise but there is no need to remove noise from an ECU output which will be a clean saw wave.
I couldn't afford (or justify) one of the more expensive high-end systems like the EMU or Emerald (Nodiz pricing has recently become very competitive), but as I'm competent around electronics, and have used the Ford EDIS before, then it was an obvious choice for me to chose the Megajolt. The beauty of Megajolt/EDIS system is if the ECU fails then the EDIS part just carries on with a fixed 10° BTDC setting by itself for a limp home mode, great bit of bulletproof engineering design by Ford on that one.
_________________ Current fleet: '75 Sprint, '73 1850, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570 (yes it's a boat!)
Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated, made out of magnetic metal as only car I've ever been crashed into...4 times), BMW 318, Golf GTi MK3 16v x 3
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