you may not need the tach... just pick up the $100 cord to hook it to whatever unit you buy... I use lowrance .... but with that budget would step up to Simrad... I have 2 HDS 7s the last one I picked up online for 699 from academy with a 100 rebate... I am networking them, the motor, sonic hub and plan to add the 3 or 4 g radar .... the addition of the radar and sonic hub was why I went with lowrance .... their radar is lighter and uses less power with better clarity than the others ... I am using the transom mounted transducer for now.... and haven't really planned to change this so I can get water temp readings .... I did get to use a 12" garmin and liked it a lot .... easy to use ... good clear screen even in sunlight... I installed all of my stuff with very little effort... nothing too difficult with any of it .... I have a good bit tied up in my noise maker also with 4 Rockford fosgate 6 1/2's a 10" completion bazooka sub running off a 600 watt 5 channel amp... ( my old mariner was loud so I needed a LOUD radio... Good luck on the endless choices ...
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