<VV> Teflon Tape?

[Sethracer at aol.com]

One more note, though. If you use an excess of Teflon tape on the threads  
of a switch, such as the oil pressure switch used on the corvair, It is 
possible  to isolate the body of the switch from a good ground, thus defeating 
the  purpose of the switch. The warning light might not come on at all - 
easily  checked at engine start-up - but not the suggested situation. Just go 
easy on  the tape, or use a switch with an external ground path. And the tape 
is only for  use on tapered threads, as mentioned.
 
-Seth Emerson  
 
 
In a message dated 4/17/2012 8:15:28 P.M. Pacific Daylight Time,  
corvairduval at cox.net writes:

Yes, it  works fine on NPT connections.  It was designed to be used with 
NPT  connections. These would include oil pressure threads.

The warning is  for standard flare and inverted flare fittings as found 
on fuel and brake  lines. Teflon (PTFE) tape is NOT designed for these  
connections.

Frank DuVal

On 4/17/2012 11:02 PM, Bob Gilbert  wrote:
> Hi,
>
>
>
> I was in the process of  installing an oil pressure gauge and noted that 
the
> instructions  called for Teflon tape on the threads. I seem to remember
> reading here  some time ago that this was a no-no for an automotive
>  application.