Piggy back pcm for trans control how to ?

[sil]

weeEeEEeell im thinking way in advance here, but next summer id like to go turbo
i want to run 8f on a 727, and a small little turbo, just enough for a good feel ont eh street, dont need no dyno queen..

buUuUuuut id like to keep my 4T60-E aha!
so im thinking i can do an ecm sway, and then piggy back the 9393 for trans control.

i have a few concerns, being piggy backed would the 9396 risk going into limp home mode at all ?

im guessing that im going to need the vss, tps and ?? hooked up to get proper trans shifting....but how would i go about doing that?

just splice into the nessecary sensors ?
isnt there 5 volt refernce signal going to tps, what about other sensors?
having both ecus supply power wouldnt be good :P so i guess id have to leave the 9396 power reference off the connection, and let the 727 feed 5 volts to tps ?

so what all sensors would i need to "piggy back" ?

is there anything good anyone can point me to to read up on doing this, anyone have experience doing this ?

i dont really want to spend the money on an after market trans control, unless maybe there is one specifficaly for the 4t60-e and it isnt insanly priced :P

i dunno

thoughts, suggestions ?

[sharkey]

you are gonna need to feed the trans computer coolant temp, map, tps, vss (feed both computers vss, fuel maps can depend on road speed) maf (if used), tach, and probly iat.

you can run refferance voltage off of one ecm and feed the signal into both, not going to cause problems. temp sensors is were it gets tricky. coolant sensors run on resistance, so when you split the signal, you end up feeding half the resistance to each computer (i think thats how it works). what you need to do is run a coolant sensor for each computer.