Alright I'll bite.
earth = ground. so just connect it to the chassis.
12 volts should be a thick red wire behind the dash fuse box and is the only wire in the plug.
ignition should also be a red wire at the BCM in the passenger kick panel. Pin 11 in the black 40-pin plug.
tach (rpm) should again also be a red wire at the Power Steering Control Unit which is left of glove box. Pin 10 of the white 12 pin plug.
Test your wires and confirm you got the right ones.
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