Hey guys. Just installed my Tiny Tach and took it out for a test today. It's the model number 2XLR for a Merc 25 EFI (this is the model Tiny Tach said I needed). The idle RPM seem to be pretty accurate (between 800 and 900) but the top end seems to be almost cut in half at around 3000 or less. I know I'm getting more than that but, why isn't it reading it?