1. An emission monitoring device for a vehicle comprising: a lightweight housing for operationally encapsulating: a processor; a computer program comprising computer readable instructions embedded in a tangible non-transitory computer readable medium; a sensor for each vehicle component to be monitored; a display device; and a power supply for power the device; the computer program comprising instructions when executed by the processor to analyze fuel being injected into the vehicle from data output from each sensor; capture data from each sensor; store the captured data from each sensor into the memory; calculate performance attributes based upon the captured data; store the performance attributes; and display the performance attributes of each vehicle component onto the display device; at least one of the sensors is a spectral analyzer, the computer program further comprising instructions to analyze data from the spectral analyzer to determine the fractional component parts of the fuel being injected into the vehicle and the housing being operationally mounted onto the inner gas lid of the vehicle.