OK, this is going to sound dumb. But my dealer told me that I can use ONLY Yamaha gauges for a Yamaha motor. I have a 2003 four stroke 90 horse motor. I want to add a tach and trim gauge. He sells the things but I KNOW I can get cheaper gauges at another outlet. I got sispicious when he said I had to use a Yanaha fuel gauge as well, WHAT? Says I? Why on earth would that be? Well, you get the idea. So, simple question, can I use another brand of gauge for a tach and trim for a Yamaha motor? If so, any recommendations? (Secondary question, I am under the impression that I can't use my old tachometer (which was attached to a Johnson 1990 88 horse) for a four stroke engine. That true? (You may have noted from my last post that this particular dealer leaves a bit to be desired as far as service goes!)