89 mariner 150hp tach help

[river rat1]

can I wire my tach up straight from the battery or can I use a toggle switch or do I have to use it straight from the control box just the power im talking about thanks for any help

 

[Chris1956]

If you wire the tach from the battery, it will be using current all the time, which will run the battery down. A switch is better. The best is powering it off the ign switch accessory post.