hey guys , i just got my D1 used ....well on the speed sence wire my buddy who had the same unit says there is a Resitor in line on the factory wire ....i dont have the extension it comes with from pionner ...does anyone know the value of it or if i really need it ??

There is no resistor on the speed sense wire. The resistor is on the reverse input wire. Which is not really needed. Though if you want to be safe just throw a .5 amp fuse on the reverse wire. Same effect as the resistor.

ok thanks man , i am not goign to bother with the reverse wire as i dont drive backwards down the street so i am not worrying about it effecting me

I don't think many people usually drive around backwards

It's to sense when you do go in reverse to make sense of the movement to the unit and give you more accurate GPS tracking.