I took the boat out for first time with the 1997 Force on it. It really performed well. I want to thank everyone here for their help. It has been a long slow process. I call this my motor from hell.. Still have some minor problems to fix. My tachometer is not working, although it may be the gauge. Seems I was having trouble with it last time I took it out. I had an 1988 90hp evinrude before. I measured the gauge and it is 4 inches across the face. So I guess I need a 4 inch gauge. Just wondering if there is anything else I should check if that doesnt fix the problem. The motor is charging the battery. I just thought of something. What wire from the !997 75 hp Force goes to the rpm gauge.