Too late for Norman, his works well now.
But a nice simple tach for reference.
Looks like these digital tachs are actually pretty universal, and can use Hall effect, NPN,PNP, dry contact and wet contact inputs, so Norman could have switched his sensor if he'd wanted. His came with the Hall sensor packaged for a little higher price.
Some of these on Ebay seem to include a connector with leads, some don't.
I ordered one to have on hand for projects. Thanks for the note
