Yesterday I went to Autoxperts located at NIPA, Gulshan to ask your query @s.usmanali2011 and there, they told they are converting it in Rs. 3,000
For that they told that they will replace guage as low pressure will not be reflected in cng high pressure meter plus filling valve/point will be replaced.
They told that they will clear cng cylinder to remove all residue gas.
Surprisingly, they did not told about extra water drain pipe. Even when I asked, they refused that they don't install it.
However they told that this will give high mileage etc.
LPG is available at Hascol pump 
Shahrahe Faisal as well as pump near to it
