On 3/15/08, Jonce Fancher <streetbugs@whispllc.com> wrote:
 At Bostig I am told I must change the Tach on my 85 to a 86-91 for
reasons of being more sensitive for the to pick up the tach signal.
The 85 is
>  suppose to be LESS sensitive in sensing the signal. But IF the only diff is the Buzzer then I should be good to go with the 85.

Actually the official line from bostig is that the 85 down don't work
with the tach output on the kit which is for the 86+, there is no
reason given as to why since we don't know either, but the electronics
in the tachs themselves are different.  If you do end up getting it to
work with the 85 down let us know, but it's easy to swap in the 86+ as
Jay pointed out. Does anyone have any definitive answers on exactly
how the two tachs are different?

Thanks,

Jim Akiba