ok explanation on how they work please and how the ignition advance ect works as im stumped

i can see the fueling is done via the metering head but all the sensors and TPS was taken off

so im asuming its a vacum system and if so whats the actual fueling like,

not a dig at ya mate greg but my mate wants a xr2 turbo and hes wondering of the whole picture

what wires ect are swoped

cheers