I have been wanting to try this on my 90 corvette.

I have a FTDI breakout from Spark fun.. some questions:
-Do I need the Diode on the TX?
-Do I need the resistor (1K) on the RX?
-Do I need to program and invert the signals for this??

It will end up being plugged into an android for use with ALDL.

I have a blue tooth device, but a hardwired solution would be great