Method B

Remove No. 1 ignition coil. See Figure.
Connect No. 1 ignition coil and spark plug with suitable high-tension wire as shown, and attach timing light clamp to this wire.

Fig 1: Connect No. 1 ignition coil and spark plug with suitable high-tension wire
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Constructing ignition lead for testing ignition timing
Courtesy of NISSAN MOTOR CO., U.S.A.
Check ignition timing. See Figure.