This is a wiring harness.  Mopar part number 4487132
 
This harness came from the Chrysler/Shelby Development center circa 1990.  I believe this harness fits the 1989 Shelby Dakota but I can't say that for absolute sure.
 
It has various connectors on it that look familiar to me such as:
 
Distributor pickup connector
4 wire o2 sensor connector
Alternator wiring
Quick disconnect connector
What appears to be an EFI plug?
 
According to Chrysler STAR parts it fits:
1988-1989 only Dodge Dakota with 318 or 360 engine
"alternator sub harness"
 
This is a very large harness.
 
But again, do your own research before committing to purchase as all sales are final!
 
This is brand new OE Mopar.