Buy a DMK Box
 
Amazon or PayPal
Model 11A-GPS+ $475 USD
Model 11A $399 USD
Buy a DMK Analog Engine Monitor
Model AEM 14 $449 USD
 

There are two DMK Box models: choose the 11A if your boat already has a GPS receiver.

If you have a U.S. Amazon account, they always have our lowest prices and fastest fulfillment.

Use the PayPal checkout for credit cards outside the U.S. (or if Amazon is out of stock).