My second dislike of the TNC Tachometer.

2. The off/on switch is a slide switch. If a person forgets to turn the switch off it will eventually run the battery down.
Note: The battery is not an alkiline. I upgraded the battery while I had the unit apart.
I replaced the slide switch with a push button switch. Now all I must do is make sure that I do not stack something on top of the tach and turn the switch on and run the battery down.

Many of you will say that I have voided the warranty by making these changes. And yes I am aware of that however why should I use a device that does not fit my needs. Besides I am an Electronic Technician and can make these changes without fear of damaging the Tach. The switch on the left is the off/on switch.

I will post some photos of the tach with the push button switch tomorrow.

Here are the photos with the push button added. Plus a side view.


Go flying and have a good time.

Lee