s13 conversion

[turbozx]

i have a couple of questions on this subject

the s13 ecu has a speed sensor input, but as far as im aware s12 and Bluebirds turbos dont have a speed sensor, so this cannot be connected does this matter, what did you do?

the other gray area is a feed for the rev counter s13 are driven form the ecu were as s12s take a feed from the coil pack, i have heard that using a feed off each coil pack with a dioide on each can work?

i have a loom made ready to do the conversion in a bluebird turbo but am unsure about these to aspects!