xshellshock

Just wanted to chime in on how I made this work for me. 07 Nissan frontier, I tapped the power side of my clutch safety switch, and used a diode similar to the OP's method. Power is on here in on and start, and I kept acc power from the radio harness. Works well, as long as my battery is still charged to a certain extent. If the power gets to low my starter will draw below 9v. For auto trans pnp switch may be another option to do this from.