[Dicky8979]

I have an 89 1500 4x4 I changed cab . I got a 91 cab put in on now speedo doesn't work. So I pull the 91 instrument panel out an put my 89 in the 91 cab. Try to start it an the truck won't start just cranks. Put the 91 instrument panel back in starts rite up but speedo don't work . Can anyone help me . I'm about to lose it