thanks,
I have make housing with joining different axis sheets my self so is not perfect like making professionally with die. But definitely, can be improve.
All parameter data is available in serial RS232 standard from interface card located under dashboard. so reading in laptop having serial port can be easily done with writing software @ windows. This might be my future DIY:).
For interfacing with mobile, we need to interface Bluetooth adapter with interface card of this instrument cluster and converting data to ODB standard.
Many applications "OBDII scanner" for Bluetooth adapter are available at app and play store, so those application can be used for monitoring on smart phones through Bluetooth interface
Cost to manufactures depends on production volume and bulk parts purchase.