Thanks for the reply.

I will give it a try as i would like to make this sensor work. I just need some guidance if possible.

1. I will remove the external crystal, less part the better, in case for this project the internal is stable enough.
2. The 4D Systems display, is an easy display to use, as they have on board chip and loaded a ready made driver for ease of use. I have this display couple of years now and it works as expected.

You can find the datashet of the display here and the SERIAL COMMAND REFERENCE

Regarding the output 3.3V from the display, looks like it is quite stable as i measured it. The Sensor's Power Supply: 3.3V~5V, so i could also use 5V.