I have a Tele with some Graphtec Ghost piezo saddles and built in Graphtec pre-amp
(Acoustiphonic I think) but you really need to run it into an acoustic amp for it to sound
its best, having said that i run it through a Yamaha magicstomp with the fabled AG stomp
patches and into a normal guitar amp and it sounds fine.
What you have to
bear in mind it that it is a fairly serious operation on your Tele, you need to enlarge
the control cavity to accommodate the pre-amp/battery and do a little routing under the
bridge plate for the piezo wiring etc. so you would have to add the cost of someone to do
this properly for you.
To be honest for the price of all this you could pick
up a Variax secondhand or even new that is purpose built for these very situations and an
excuse for another guitar
HTH
Dan
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Two interesting facts about me: 1)My Knob is the length of two Argos pens 2)I'm banned from Argos