Static ignition timing

Hi to all,i just changed my timing chain and tensioner,
and want to check the static ignition timing.
I found that the marks are ATDC, TDC, BTDC, BTDC, BTDC, BTDC
[-5]---[0]---[5]---[10]---[15]--[20]
From left to right,but not sure if the TPS has to be unploughed.
In some of the topics say unplugged some not.And do i have to disconnect it wile the engine
is running,or disconnect it and then start the engine?
And if i do not disconnect it will i see the right timing?

Thanks in advance!
 
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