"Jerry J. Wass" wrote in message
...
DON'T TAKE IT APART !! At least not until you have lubed the drive
cable..
when they get dry, they start sticking somewhere, the part in front of the
"stick"
winds up a little, then releases this energy in a quick snap, this causes
the
instrument to read high. I know this may sound silly, but it happens every
winter
with my trucks.

TOO LATE !! But I got it back together. Even used all the pieces

Actually, you anticipated my next thought. I got to wondering if I was
assuming too much by blaming the tach head. I'm going to reassemble the unit
in the case and lube the cable.

Thanks, Jerry.

Rich S.