Opposite the rotor button when the rotor points toward the 6 o’clock position if viewed from above.
It's worth noting that the numbering sequence for spark plug wires in this distributor can be counterclockwise (1-5-3-6-2-4) or clockwise (1-6-5-4-2-3), so the positioning of terminal 1 may differ depending on the specific engine variation.
To ensure accurate identification, refer to the vehicle's specific service manual or consult with a professional.