Under dash 2

Under construction

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Under dash part 3

Davies-Craig controller

Remote control receiver

Power socket

Arduino controlling alarm, indicators, central locking etc.

Heater pump switch

Fuel pump switch

Idle speed manual adjust

Cold start auto/manual switch

Bonnet release switch

Mosfets switching indicator lights

Arduino and motor shield controlling idle speed motor

Bonnet release circuit

Power filtering

5 volt supply

H-bridge controlling door lock motors

Once you start connecting individual circuits with wires and cables, things start to get complicated and a bit messy. The best way is to put as many circuits as possible on one pcb and make the inter connections pcb tracks rather than wires. However, if you are developing and modifying several circuits over a period of time this is not so easy or even at all practical.