Bought a used Horizon tach
My old mechanical tachometer was going bad (showing 200rpm drop) so I decided to go digital. I found a used Horizon P-1000 and installed it. Now Im really confused. It shows I'm turning 1700rpm at full ground static while my hand held tach is showing 2650 (hartzell CS). It came out of a Bonanza with a 6 cylinder. So my question is, are these tachs programmed for specific number of cylinders or is there something I need to do to get this thing to read correctly? Sun-N-Fun is a few weeks away so I need to get this resolved. It is wired exactly as the manual states and all the other functions work as advertised.
RV-4 (N124TT) Sold