i found what i wanted.
Arduino - LiquidCrystal
let me talk what i think about connect the arduino with my car and you can say if there is right or not.
I have the elm327 working. I will to assemble my arduino kit with LCD 8x2 like the schematic on the link above. After this, I will write a program in C/C++ to connect the arduino's serial port to elm327 serial port and read rpm, speed and so on.
Its right or I am entire crazy now? hhahahhaha....
thanks for you patience