[jondee86]

The small red wire on the grey plug is connected to a common relay switched
12V power supply that is activated when the key is switched to the ON position.
This relay also supplies switched power to...
1. the engine ECU
2. an Innovate LC-1 WBO2 and DB gauge
3. a small relay coil that is switched to ground by the ECU to generate a back
emf voltage spike for drive my tachometer
4. the ISCV
5. the HFS-3 control unit
6. the HFS-3 alarm relay (white wire grey plug) I use this to turn on a LED on
the dash to tell me that the system is spraying (via the brown wire grey plug)

The green wire on the grey plug is connected to the ECU side of injector #4.
Previously this was connected to an ECU AUX output programmed to mimic
IDC. But when I upgraded the injectors and went to full sequential I needed
the AUX output as an injector driver.

As I recall, I did change some settings (THRES and GAIN) on the HFS-3 at
the time I fitted the new injectors, so it is quite possible that I have messed
up the settings. I will alter the THRES setting tomorrow and make a test to
see if there is any change.

Cheers... jondee86