Hi Colin,
I've fitted Acumen DG8 Gear Indicators to my last two Tornado's and they have worked really well although the do take a second or two to display the selected gear, depending on the amount of your engine revs.
There are 5 wires to connect which I tapped into the wiring loom at the back of the clocks.
Switched Power Supply - Red DG8 Wire colour - Green/White Tornado wire colour
Neutral Signal - Green DG8 Wire - White/Violet Tornado wire colour
Speedo Signal - Orange DG8 wire colour - Dark Blue Tornado wire colour
Tacho Signal - Brown DG8 wire colour - Orange/Grey Tornado wire colour
Negative Earth - Black DG8 wire colour - Black Tornado wire colour (see later post on how to identify the correct black wire)
The unit attaches to the side of the clocks with some self adhesive Velcro tape
If you do decide to fit one, make sure you get the blue LED to match the colour of the Clock illumination
