Andy wrote:

nxrsr20 wrote:
It's sat in my head for years but other items have been more interesting pursuits (like turning an Android phone into a data logger).

Now, I like the sound of that! Tell me more!!

The free software is called "WiFiLapper Full", it talks about using a board called IOIO (pronounced "yoyo"). I need to pull my finger out, purchase the board, thermocouples and other devices and then start some coding.

knoxy_7: You would need to check what is the voltage that comes out of the GPS when that gear is selected (check individually to confirm they don't have a different voltage.....I suspect it will all be the same voltage either 5V or 12V).
Three ways to do it.

- Simplest way if it's the same voltage, you have 6 LEDs on your dash hooked up to each individual gear, you need to set up 6 LEDs with resistors so you don't blow your LEDs.

- If it's all the same voltage, you would need to have something with multiple digital inputs to a device that can drive a LCD display and crunch out a nice number on the display. Very simple logic.

- If it's variable voltage, then you need a device with an analogue input that can drive an LCD display and crunch out a nice number on the display. Similar logic to above.