Well all i do when i re-connect all the cables after a rebuild or whatever is flick the killswitch to 'on' with the TPS unplugged - see what the pointer thing on the RC valve says then immediately flick the killswitch off again and adjust the cables abit. Then I plug the TPS in and flick the killswitch on again, let the valve move then flick it off again. Unplug the TPS, flick the switch on, see where it stops, adjust - and so on until i've got the pointer lining up with the punch mark every time with 'happy' tension in the cables. I found if they're too slack they don't line up the same every time the servo moves but of course if you go too tight then the servo motor makes its 'complaining' noise at you. Which, if you left it like that because you had the radio on whilst you were working and hadn't noticed the whine/buzz (not sure how best to describe the noise tbh), you'd end up with a nuked PGM!
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After years of moaning about immigrants now i am one...