[RiceBox]

Just buy a tach and stick it on your dash. Click on my sig, there is a picture of mine there.

 

[RiceBox]

I tapped a line right off the ignition coil. It doesn't look good but it works. I'm not sure how the GA16i is wired, but you could try it my way.

 

[RiceBox]

Go to your distributor. The one line that does not go to the engine goes to the ignition coil. You have to splice a new wire onto the green wire on the ignition coil. Atleast that is how I did it on my e16i. Your engine is different from mine.