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I got this Snap-On timing light that have a digital LED screen) (you can change the numbers from 0 to 200). I was told that to change the timing, you set the LED numbers to 10 (on our supra) and set the timing on the car until it reads 0 (on the car)

Is this the right way to do it?

or is it that you set the LED readout to 0 and change the timing on the car until it reads 10 on the car?
 

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What is the proper timing on our cars? I've read both 10 and 12... I timed mine to 12 after doing the timing belt and its running perfect...
 

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it says in the service manual, that when you bridge the two connections in the diagnosis connector, the two that you bridge to check for codes, you should have a timing of 10 btdc. without that wire, it should be 12 btdc. i just did mine 5 mines ago . i just finished my rebuild, and it was set at about 4 btdc...
 
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