Analogue tachos for 9.9

[Boomerang]

G'day from Downunder,
I've got a sailboat with a pair of high thust 9.9's. I'd like to put a pair of tachos on. Three questions:
1. Anologue or digital?
2. Is there a gauge that has 2 needles, L and R, or do I need two gauges?
3. Do I run a line from each engine or from the remote start switches?
Many thanks.

[Sequoiha]

analog or digital, either is fine, for a portable engine i would use an analog.
you would need two tachs.
if you have the yamaha wire harness and keyswitch there is a tach lead coming out of the harness.

[Boomerang]

Thanks. As I have a long distance from the port motor to where the tachs are going to go, which is right next to the keyswitches, my preferred option is to take a wire from the keyswitches; do you know if that is possible? And any suggestion for which tacho kits (x2)?

[boats.net]

Use one tach per motor and the dark green wire from from key switch is tach signal and yellow is key on power.