Got a buddy that just bought a 2000 F350 dually. There's a box under the dash that says it's from SP Diesel but doesn't say what it is. One end has wires that connect to a pontentiometer on the dash. The other end has 3 wires that run through the firewall and are just dangling there. It looks like the same type of the plug for the ICP sensor. Is this box just a fancy 10k mod? Any thoughts or ideas would be helpful. Thanks!
Todd