Hi
I am trying to fit this steering wheel onto my 1990 SW20 Turbo, can anyone tell me what I need to do and what parts I might need to change (Part numbers etc).  Or if this question has been asked before a link to the previous post.
Cheers
 
 

Looks like you have the 'clock spring' type horn connection on your steering column.
The wheel you have pictured is a 'slip ring' type.
I don't know how many parts you will need to fit it, but the pic below shows the slip ring type steering column.
At the top of the hub to the right is is the spring loaded connector that engages the slip ring.
Looks like your existing turn indicator cancel should work ok
 
 

 

There is quite a difference between the JDM version compared to the ADM.  Top picture from 'Rustbucket' is a JDM type.  Pic from 'Reddtarga' is from a ADM by the looks.

Carmikey
 Pic from 'Reddtarga' is from a ADM by the looks.

That's correct
 
He probably needs to look for that horn assembly from an ADM '90 model NA.
 
I think after '92 the ADM cars had the 'clock spring' type like what he has now.

Thanks
I decided to remove the brass ring from the outside of the steering wheel hub (it just pops off) and get the dremel out and notch the space for the horn connector. I seems to fit ok but not sure if everything is working as I have the back end up trying to replace the struts. And yes should have said its a JDM GT Hardtop

That's lateral thinking (if it works lol)
Here is what the back of the later model clock spring S/wheel looks like:
 

 
Thanks for the Picture, good to see it looks somewhat like the DIY job. Fingers crossed its all good