IMacC
New member
I have recently fitted two Prestolite alternators to my Volvo TAMD41B engines and also need a new tachometer for one engine to replace a faulty Volvo/VDO one. I thought it would be simpler and cheaper to buy two new matching tachos and opted for KUS units (which appear to be very similar to those from Wema).
There are two control positions on the boat and I am only going to change the tachos on the lower internal instrument panels.
The instructions for ‘calibrating’ these tachos are written in best Chinglish and despite following them as best I can, I cannot get sensible or stable readings. What puzzles me is that I would have thought that the pulley ratios would have had to be an initially set somehow before then setting the instrument to correctly display a known RPM, but there is no way of doing this. I am using the ‘W’ terminal of the alternator as was previously used with the Volvo tacho, and indeed this still works perfectly with the existing good Volvo unit.
Has anybody done this exercise before and succeeded?
There are two control positions on the boat and I am only going to change the tachos on the lower internal instrument panels.
The instructions for ‘calibrating’ these tachos are written in best Chinglish and despite following them as best I can, I cannot get sensible or stable readings. What puzzles me is that I would have thought that the pulley ratios would have had to be an initially set somehow before then setting the instrument to correctly display a known RPM, but there is no way of doing this. I am using the ‘W’ terminal of the alternator as was previously used with the Volvo tacho, and indeed this still works perfectly with the existing good Volvo unit.
Has anybody done this exercise before and succeeded?