The display pins themselves won't matter compared to the pins used for the car communication circuit.
Have you seen:
OBDuinoInterface - opengauge - OBDuino OBD2 cable and Interfaces - Open Source Fuel Efficiency Instrumentation - Google Project Hosting ?
That shows the circuit for ELM327.
The LCD pins should be able to use any of the digital pins not consumed by the car communication circuit.
Figuring out the pins for the LCD to match with the code should be easy enough with the datasheet, but I happen to remember them:
16 - Backlight Ground.
15 - Backlight Power
14 - DB7
13 - DB6
12 - DB5
11 - DB4
6 - Enable
5 - Ground
4 - RSPin
3- Contrast.
2 - 5V
1- Ground
// LCD Pins same as mpguino
#define DIPin 4 // register select RS
#define DB4Pin 7
#define DB5Pin 8
#define DB6Pin 12
#define DB7Pin 13
#define ContrastPin 6
#define EnablePin 5
#define BrightnessPin 9