Gksportster

Hello I thank I got a good deal I went to a wrecking yard and got a 06 Chevy express 3500 van 6.0 l long block with 317 heads for $150. Some one took the accessories and injectors and computer and transmission and exhaust .
The van was wrecked in the frount end and the people at the wrecking yard punched a hole in the oil pan to drain the oil ..

Does any one know of a way to get the odometer to turn on so I can get the mileage of the motor ?
Some one cut a lot of wires before I got to the van I was thanking of taking a 9 volt battery or some battery to power the odometer up by pulling the dash out and cutting off the connector and hooking up the wires.
But I don't know which wires to connect ?
Thank you kelly