tach drive unit question

[Jrowe]

I have a l285 with a 4 cylinder and the tach drive unit is shot and I found a tach drive unit that is for a b2400 or other 3 cylinder engines. It looks the same other than it mounts with 2 holes and not 4 holes but looks like the two holes and in the same place as the stock tach drive. Would this work for my tractor?

Thanks for any help

 

[ShaunRH]

Don't know if it would work but tach drives are all about gears and RPM's. If the gears are the same and the engine speeds are the same, then the cable is turning at the same rate and it should be fairly accurate.

Personally, I'd do a magnet tachometer off the crank shaft or flywheel myself. Those are very accurate and pretty easy to install.

This is a hall effect tach, digital:
http://www.ebay.com/itm/Digital-LED...712418?hash=item5b1c1d6522:g:EyAAAOSwWnFWAACk

Here's a combo Hobbs unit and Tach:
http://www.ebay.com/itm/Electronic-...534112?hash=item3cdd75f9a0:g:bX0AAOxygj5SiIcE

 

[Jrowe]

Thanks for the help. Could you maybe go into a little more detail on where and how the sending unit would mount and any other information. I've never used one of these tachs. Thanks again