Older Cummins 8.3 Fuel Feed Linkage at Startup

Many mechanical engines had air throttles-- easy to tell. Under the throttle, is there an air line, mechanical cable or electric wire? Newer electronic engines generally have electric throttles (basically the throttle is a rheostat).

You can also look in the engine compartment. Does the linkage from the injection pump go to a device supplied with air or electrical wire, or does the mechanical cable go forward?