Is the place to ask about tachs? Or is there a better section to ask this question?
Here's what we have. A new to us 1990 Bayliner Capri with the Mercruiser 3.0 and distributorless ignition. Everything works but the tach. 12V, ground and tach signal were verified good.
Part 1. Originally it was totally dead, so I took it apart, cleaned the contacts and then put it back together. In the process I noticed the switch for the # of cylinders was missing, completely, but did nothing about thinking maybe they use the same housing for different models of tachs(more on this in just a moment). So I put it back in the boat, turned ignition on, and the gauge slowly climbed to about 6K and stayed there. Fired up the motor and the tach didn't move, stayed at about 6K.
Part 2. I did notice that when I had it apart I saw marks across the contacts on the circuit board where the # of cylinder selector would have been, as though it was there at some point, so I took it apart again, and slodered a jumper to pin 2, which according to the sticker on the housing states is for 4 cylinder/4 cycle, put it back together, into the boat, turn ignition on, no movement, start the motor and the gauge seems to work, but it reads low. At idle the gauge points to 0 RPM, and moves up and down accordingly to engine RPM.
So, is setting 2 not right? The other choices are 3 for 6 cylinders and setting 4 is for 8 cylinder motors. Setting 1 is blank. We'd really rather not have to buy a new tach, hoping this one could be made to work correctly again. Any thoughts? Thanks.
Here's what we have. A new to us 1990 Bayliner Capri with the Mercruiser 3.0 and distributorless ignition. Everything works but the tach. 12V, ground and tach signal were verified good.
Part 1. Originally it was totally dead, so I took it apart, cleaned the contacts and then put it back together. In the process I noticed the switch for the # of cylinders was missing, completely, but did nothing about thinking maybe they use the same housing for different models of tachs(more on this in just a moment). So I put it back in the boat, turned ignition on, and the gauge slowly climbed to about 6K and stayed there. Fired up the motor and the tach didn't move, stayed at about 6K.
Part 2. I did notice that when I had it apart I saw marks across the contacts on the circuit board where the # of cylinder selector would have been, as though it was there at some point, so I took it apart again, and slodered a jumper to pin 2, which according to the sticker on the housing states is for 4 cylinder/4 cycle, put it back together, into the boat, turn ignition on, no movement, start the motor and the gauge seems to work, but it reads low. At idle the gauge points to 0 RPM, and moves up and down accordingly to engine RPM.
So, is setting 2 not right? The other choices are 3 for 6 cylinders and setting 4 is for 8 cylinder motors. Setting 1 is blank. We'd really rather not have to buy a new tach, hoping this one could be made to work correctly again. Any thoughts? Thanks.
