Rich S. wrote:
On Aug 7, 9:52 pm, Ron Wanttaja wrote:

. . . Unfortunately, as it turns out, there was nothing wrong with my
tach...or with the tach cable. The tach-drive section on the engine
itself (Continental C85) was bad. . . .

And, what do you plan to do about the stray pieces of the old tach
drive which are floating around in your oil? )

That's why the engine has the oil screen, right? :-)

Actually, the tach drive is external to the engine. It's at the end of
a longish shaft on an idler gear inside the accessory case.

Ron Wanttaja