In my quest for manual transmission control, I've been considering the Montana Fab unit, which is now nearly plug and play. However it's a rotary switch (not very slick) and it's a steep 150 bucks for control of only 1-2 gears. No check engine light however.
I started looking at the RADesigns rail shifter, and I think I'm sold.
From R.DesJardin-
"If you use a switch you can have either manual or automatic mode.
You can use the Rail in with the floor shifter in any position, although not all thegears are available. In OD you get 1-4, in D you get 1-3, in 1/2 you get 1-2.
Remember it's an electro/mechanical transmission.
I have a seperate lock up switch for the TC, this allows me to use it as needed.
Engine braking is similiar to stock, the shifter does not change engine braking, unless you run the floor shifter in a gear to correspond with the gears you are in with the Rail.
For instance with the floor shifter:
in 1/2 you get engine braking in 1st and 2nd.
in 3 you get engine braking in 2nd and 3rd.
in OD you get engine braking in 3rd and 4th.
Several customers have bought code readers from discount auto part store to reset their computers before inspections."
It seems really slick, I can choose OD, and I can switch it to stock. Only $80.