trousermonkey

I need some helpfull advice please. I wanted a tach im my 93 pick-up but didnt want to spend a fortune I was lucky enough to get a factory cluster from a 95 pick-up both having 22re engines and 5spd shift i was happy I also was able to get the oil sending unit with it after completely changing everything over all works fine except the tach. I might be wrong and usualy I am didnt these year puck-ups come pre wired for tachometers or do i have to run a jumper wire, I checked the wiring on both vehicles and I cant see any difference.
Please help !!!!!!