The computerize gas analyzer will print out report of each emission after each test. Emission of pure diesel operation was tested three consecutive times starting from running at the lowest rpm (idle), approximately 800 rpm to the highest rpm of 4000 rpm. Printed out of the results were collected after each test had been done with accuracy. After that, emission of HCNG Diesel dual fuel operation was also tested three consecutive times from the same conditions which starting from at the lowest rpm to the highest rpm. Printed out results were collected after the all three tests had been conducted with gas analyzer with accuracy.