Well first you need one of these, a timing light
Its pretty easy to use one of these, just get the ht lead connector and put it on #1 ht lead as shown above and then place the claws accordingly on your battery terminals
Next you need a piece of wire, with this you need to short out the diagnostic box
This diagnostic box is generally located beside the ignitor pack, fuse box and resistor area, with the wire place one end in "T" and the other end in "E1" as shown above
It should look like this
Next get a 12mm spanner and loosen the bolt shown above so that the Cam Angle Sensor is able to be moved
Start your supra then pick up the timing light and shine it on the crank pulley, the timing light should show the crank being on 10° BTDC
now this is a really bad pic but you get the idea, if the light on the crank pulley isn't on 10° BTDC adjust the cam angle sensor accordingly till it is... once finished, tighten up the cam angle sensor, check withe the timing light it is still on 10° BTDC if so switch her off and remove the timing light... you're done :)