I'm a Cummins guy done a trade and got a Duramax project truck what I'm told is a 2004 with a 104 K on it . I can't locate the dipstick for the oil on it . The speedo don't work nor does the shift select indicator anyone have a clue of what might be the issue , also I'm thinking about getting a different cab what all needs to be kept from OEM wiring to make it drivible ?