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The 'high tension lead', is also called the spark plug lead. It is a thick heavily insulated wire with a copper or carbon core that connects the high voltage electricity from the ignition coil to the top of the spark plug.
Check the earth wire. (sometimes they are spliced together in the harness). Otherwise splice (connect) the earth from the display unit directly to Batt Negative and see if that solves it. Then you know there is a serious volt drop in your earth system. MAKE SURE you are earthing the correct wire.
Check fuel lines and the spark plug wires for cracks or rips. The plugs may have been damaged when you hit the tree. Check fuel pump connections for loose or broken connections. Sounds like no fuel to the plugs to keep it going. If you hit the tank, check the fuel pump operation was not damaged.