What have you guys used for vehicle speed? There are a lot of setups and I'm curious whats the most effective or easiest.

Using stock wheel speed sensor? - what signal converter?
GPS?
gearbox mechanical to vss signal? (doesnt work for my application due to rx8 transmission but stock one or FD people may use it)
driveshaft? or is this too old school?

 

I did the gearbox to vss

 

I like those but with my rx8 gearbox it does not have that capability...

I ended up going with the Vnet module from racepack - word of the wise the price INCLUDES a GPS antenna - the description was too vague and I accidentally bought one that I don't need and now I need to return it. So I will post back with results and see how good it is.

I'm using my OEM abs wheel speed ring for the monit rally computer.