i use a sub I/J map to control the HSV of my aquamist 2C on my 3000gt !
go to parameters settings and I/J
select CH-5 or CH-6 and right clic on the type box and select sub I/J
then select a sub I/J map and make your tune in fonction of boost and RPM.
you will be able to make a tune like the map in the 2S documentation
edit : if i remember, the EMU I/J output will put the signal to the ground ! so just put a 12V + fuse on your HSV !
and then, you can use a NVCS map with ON-OFF relay to control a IC spray or something like that !
@+
fred