Tachometer or Tach Cable

BTIZ wrote:
Why do you have to thread it through everything? Tach cables come in two
parts: cable and housing. If you disconnect both engine and tach ends,
you can pull the cable out and thread a new one back in, using the old
housing. Be sure to use plenty of moly grease, to keep the cable
well-lubed. BTW, any speedometer shop can make up a new cable, with the
proper ends.


Question... is a tach cable made up at the local speedo shop an approved
aircraft part?
Does it need to be?
Or does a DAR have to approve it as a suitable replacement part?
Or can an IA do that?

BT


Well... maybe it requires a DAR... or maybe it could qualify as an
"owner produced part"... or maybe it could fall under the category of "I
don't know... it was like that when I bought it."

Anyway, I went out and looked at my cable and housing yesterday. After
fiddling around with it for some time, I concluded that that cable and
housing sure looked good to me. I ordered a new tach from Spruce which
should be here Thursday. When the cold weather hits, if it WAS the
tach, I will know it. If it WASN'T the tach, I'll know that for sure as
well. I would have preferred to do an accurate diagnosis first, but for
the price, I've done SOMETHING to advance the resolution process.

Rich