I don't know why Bean would have not used the factory tach or the factory gas gauge, it is taped over in the original location and an aftermarket IH style gauge and sender were installed with the aftermarket tach. Of course the gauge is funky, works sometime, and the terminal on the sender is stuck, cannot remove the wire as the stud turns in the sender. I am thinking about replacing the sender with a Chev and enabling the original gauge in the dash. In the mean time, I have a stick for checking the fuel level, seems pretty reliable.
Is your gas tank in the stock location or under the tail board? If it's at the rear then it's a custom Bean tank and it's easier to adapt something else that works for them no matter what chassis they install their body on. If you have a mid-shaft pump then it may have an IH parking brake on the back of the transfer case.
Now that you mention it, the grill, parking lights and dash did get updated as production went on, but for the most part they are hard to tell the year at a quick glance.
Mike B
