I just bought this tach from a small engine shop on Ebay.
* Reads Engine RPM up to 15 inches (35 cm) from the ignition wire
* ON and MODE Button Turns off automatically
* Display Window protected with Lexan film
* Displays up to 20,000 RPM with a 10 rpm accuracy
* Engine RPM is updated every .5 seconds
* Large Display for easy readout
* Shielded antenna lead for “hands free” operation included
* Replaceable 9V Battery included
* Weather Proof housing including protective “rubber” casing
* Can be set for single and multi cylinder engines, 2-cycle and 4-cycle
* Maximum Recall of RPM
* Complete Operating Instructions included
* One year limited factory warranty
I have sent a message to the seller to see if he has more available. It seems like a great unit with fast .5 sample rate, replaceable battery, max RPM readout, etc.
I'll post a follow up once I get the tach.
It was $99 shipped
EDIT: he does have more available, and as a newbie 'round here, I would love to know the appropriate way to share info for those interested.