A magnetic, hall effect, optical or magneto resistive sensor usually mounted internally in the engine, externally to the engine are in the distributor to inform the ECM or PCM of the crankshaft position location of No. 1 piston, and crankshaft speed for ignition timing and other calculationneeded by the system where RPM is in input.
Rate of the volume in the cylinder above the piston when the piston is at bottom dead center to the volume in the cylinder above the piston when the piston is at top dead center.
A master cylinder that has one cylinder bore, but two pistons into fluid reservoirs. Each piston applies hydraulic pressure to two wheels only. In the event one of the hydraulic circuit fails, the other provides enough breaking power do you stop the vehicles.
And enclosure for the differential and drive axles.