1999 150 mercury efi timing

[Apex2007]

I’m going to check timing on my motor. I want to run 87 octane fuel. From what I understand I should set it to 19 degrees max. Does the efi have the timing module that people talk about unhooking so it doesn’t retard timing after 5600? Thanks

[OnPad]

You should unhook the white/black stripe from module to your switchboxes before timing. Factory spec 20° at cranking speed.
Make sure you don't have one of these or it changes the ball game.