My guess is that you have the smaller dash (with accompanying gauges) from 36-39, grafted or bolted on to a 41-46 truck. The windshield has a dividing bar, not correct for the earlier trucks which had a single piece of flat glass. The steering wheel is 41-46 also. It actually looks pretty good and I was just go with it. The vendors have inexpensive decals for the earlier gauges so you can just fix 'em up.
Kent