ummm the 96 60hp model doesn't have a rectifier... if the gauge it's self is fine then most likely it is a voltage Regulator, This is a little silver box with 5 wires comming out of it... 2 red, 2 yellow and 1 grey, the grey is the tach wire, first place to check is make sure the plastic covering the box isn't melted, this would be a dead giveaway, believe it or not... the regulator goes out quite a bit on the mercury products, and they aren't cheep.... if you've got any other questions feel free to email me.