Re: What kinds of engine instruments are on your b
the mercruiser smart craft is NEMA 183 compatable, Navman and North Star GPS( Brunswick did own them, i think they just got sold off) are plug ins to the smartcraft systems. Volvo has had the same on their diesels for about 5 years. Most every one in the market is now offering NEMA in/outs for displays. I hooked a Bennet trim tab indicator( NEMA 2000) to a RayMarine E-120 last week, i'd rather have separte gauges personally, but it worked like it said it would.
Recomended max rpms for current MPI Mercuiser 4.3, 5.0,5.7, 6.2 engines is 4800-5200. Older engines( pre vortec head motors) were 4400 to 4800( most people proped the 5.7 out to 5000, they feel good there). Your 250 six needs to turn 4400 max( light loaded), ahd a friend that hot rodded his, he turned it 6500 with stock bottom end, never had a bottom end problem. I don't know why, but allmost every engine combo i have monitered for fuel burn, seemed to like 3000 to 3200 for best fuel burn to speed, it didn't matter if it was 4 cyl, or 500 hp v8( it depends on which hull as well)
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