Here we can review inputs to the control unit. (A) Battery supplies electric power through (B) Current Supply Relay. (C) Throttle Switch indicates acceleration or coasting. (D) Pressure Sensor gives engine load and full-load information. (E) Trigger Contacts in distributor give engine speed, and trigger the injection. (F) Temperature Sensor I reports air intake temperature, while (G) Temperature Sensor II reports engine temperature at the cylinder head.