ca18det conversion with s13 clocks

[terry]

Im planning on doing a ca18det conversion into my 89 s12, now im getting the engine gearbox(i know its not needed but mine has 150k on it) s13 prop shaft and the full engine loom with ecu igniter and dropping resistor.

Physically fitting the engine isn't too much of a problem, i understand that i have to cut the tunnel a bit, weld the gearbox mount and make a hybrid s13/s12 propshaft to get things working.

Now what has me confused is the wiring(surprise surprise ), ive read the guide on here and on club s12 and there seems to be a lot of confilcting information about how its done and with a white plug needing splicing??

Id like to hear from people who have actually done this conversion as to how they wired their engine into their car , its also my plan to do an s13 dash conversion down the line with s13 instrument cluster so whats the handiest way to get the speedo working?(it being electrical and the s12 being mechanical)

any information, tips or pointing in the right direction would be great

thanks