Check out modyourcar.com.au I got a Pivot speed meter for $152, it removes the 180km limit, displays speed up to 350km/hr and gives you times and terminal speed for 0-100m, 0-200m, 0-300m, and 0-400m.
There are only four wires and it is easy to install, (comes with ecu pinout diagrams for all models). Good value for money i reckon, plus the hicas still works normally.
Lawrence