I main in both n zaps, so this is what I go for,
The 89 has sprinkler and ink strike, so you want to put the sprinklers down and push on, or use them as bait. Regardless I have ink recovery and ink saver sub, since I focus so much on using subs. I also have my special charge up, and swim speed up. I find the n zap doesn't use a lot of ink so you don't really need to ink saver main. I stay alive but if you have a harder time doing that, it might be worth it to do special saver.
For the 85 I change my gear up a little, since I have echo locator I want my duration to be longer. Sometimes I like my bomb range being longer as well since I have splat bombs, depends on the mode or map. I keep with the special charge up.
On both guns I like to have ink resistance and ink recovery and ink saver sub. You can play around with the others, but duration up on echo locator is nice for the team.