Are you going to use the stock cluster? Are the gauges electronic or mechanical?
I'm sure most of the gauges in the truck work independently from the computer.
What where you wanting to graff together?
The engine harness I supply kind of runs on its own. Hook up a few wires and you're done. If you have a few spare fuses on the stock fuse block, you could easily remove the one I supply and run it through the stock one.
The other wires on my harness are batter and ground. You could run the batter wire through the stock fuse block too.
The ground just bolts onto the cylinder head.

For the water temp gauge, simply use the three wire temp sensor. The fuel gauge should be stand alone. The oil pressure can be reused on the new engine. The volt meter/ampmeter usually works without hooking anything up to the pcm.

Hope this helps, let us know if you have any more questions,


allen