How we can convert data read on CAN BUS? I am reading IDs

Hi experts, I got stuck into a problem. I am reading data coming from my vehicle can bus and i am getting IDs and data bytes. But i don’t know what to do with this data.

Although, I tried to search about decoding of canbus IDs but failed to find any useful information.

I am using sparkfun CANBUS shield. Its reading raw data but not RPM and other parameters. It is showing 0 RPM. I attached screenshots of my serial monitor.

You help and suggestion will be much appreciated.

Thank you.