On your 1JZ engine harness, look at your fusebox connector EA2.
There are 2 wires on connector EA2 that go to your temp sensor, Black/Red (thin) and Light green.
Now look at your temp sensor. It has 2 pins. The light green wire from EA2 goes on the top pin, and the black/red wire goes to your bottom pin.
If you don't already have one, you will a 2-pin connector to connect to your temp sensor. I got this connector with pigtail from a late 80s corolla.