Thanks for the feedback.
I have looked at the Omex system, DRE (digital race electronics), Aces (Caterham recommended system) and Shifti.
From the technical info I can get and cross ref between manufacturers I have so far the following.
Aces - not suitable for ECU3 without circuit board modification - the systems needs to see a voltage rise of at least 8V to operate - the ECU3 has a low voltage tacho feed I am told.
Omex - different versions available depending on ignition system.
DRE - provide a single unit tyoe and instructions for wasted spark ignition systems - looks good so far. Can be programmed easily - the multiplier to be reset like Charles has mentioned.
Shifi - no idea at the moment - but quite complex to program via the leds.
Gut feeling is the DRE system at the moment - all in one small enclosure including your choice of leds colours and integrated digital display. £80.00
Any other feedback??
Cheers, Andy