Re: What service manual is better?
Get the OEM manual. I just got mine for a 89 OMC / Cobra.
I have the Seloc too and it SUCKS. The OEM one is 1000 times better. The wiring diagrams are in color, the pictures/illustrations are clear and easy to see, and the exploded diagrams are much easier to use.
The Seloc manual is almost unuseable.
Just search eBay for OMC manual. You'll find quite a few. I saw two or three sellers that have almost every year OEM OMC manuals.
I got mine brand new for $60. The Seloc POS I paid $40 for.
Here's one seller with a ton of em.
http://stores.ebay.com/SEARAYMAN13