timing lights are hard to use on a nissan because they don't use standard leads so what i did was get copper wire rap it around the top of the spark plug attach the coil with the wire coming along the side of the spark plug and up from the side of the coil boot then i attached the wire to the timing light pick up. this worked for me.
you know you use timing lights very rarely so do what i did return it after you use it and there you saved $80
for r33 gts and gtst the timing is at 15 degrees from the factory and 20 degrees for the r33 gtr
good luck