Tacho testing

[HughN]

Quick question...

If I wanted to test a bog-standard, ex-works, driven from the CDI coil, two-stroke tachometer by putting a square/half-sine wave on the signal pin, what sort of voltage range would I need to cover?

I've no idea what the sort of voltage gets generated for the ignition system.

Thanks
Hugh

[simsy]

I would expect it to work on 20 volts peek to peek, even if the outboard drives it harder.

Start low, I would not go above 50v p-p without knowing more...

[HughN]

Thanks.