Ebay!!!
I am still keeping my order for the small tach that gets it's pulse
from a spark plug wire in case this has problems. Anyway..no
more adding "speed sensors" or paying people to hack my unloved
blue alternator (which has given ZERO problems in the 43
years on the boat.)
Here is what I found...perfect if it really works...coil sensing...the
range I want ..and the size I want....and inexpensive too.
https://www.ebay.com/itm/13290736972...6f6%7Ciid%3A14