For a 2.0 liter 914, the stock fuel system is the D-jetronic system. Its primary measure of load is the Manifold Pressure Sensor (MPS), a silver hand-grenade looking thing over on the right side of the engine bay; it has a four-wire electrical plug and one vacuum hose going to it.
The correct injectors for that would be Porsche part number 039-906-031A , or Bosch part number 0-280-150-038 . Those seem to be NLA at the moment, though. (
Link in the catalog)
These injectors have green plastic parts, which differentiates them from the 1.7 injectors (yellow or sometimes black) or the 1.8 injectors (light blue or rarely purple).
The correct fuel pressure for the D-jetronic system (used in the 1.7 liter and 2.0 liter 914s) is 2.0 bar, or 29 PSI.
--DD