No tapping? Not with a 1/8' 'NPT tap?

On Fri, 2011-05-27 at 18:08 -0700, Scott Daniel - Turbovans wrote:

> for sure can't have only one thread of engagement.
> but don't go tapping.
> tapered thread right ?
> turn it in until there's some resistance.
> don't use teflon tape on the threads...as that's an electrical connection -
> the OP switch has to make ground in the engine block.
> you should get 4 turns maybe.
>
>
> ----- Original Message -----
> From: "Rocket J Squirrel" <camping.elliott@GMAIL.COM>
> To: <vanagon@GERRY.VANAGON.COM>
> Sent: Friday, May 27, 2011 5:37 PM
> Subject: Re: Torque spec that requires calibrated fingers
>
>
> > Thanks for the tip, Mike!
> >
> > I just received my Autometer oil temp senders and tried one in a
> > fitting. They are 1/8'' NPT threads and "finger tight" is only about one
> > turn. It worries me to have only one turn of thread engagement. I'm
> > tempted to go at the threads with a tap and die.
> >
> > On Fri, 2011-05-27 at 19:57 -0400, Mike S wrote:
> >
> >> >warning light sender has this to say about torquing:
> >>
> >> Well, for regular bolts/screws, with experience one does develop a
> >> "mechanic's feel," where you can feel when the bolt starts to stretch
> >> and full "torque" is achieved. (I quote torque because it is an
> >> indirect measure of clamping force, which is the real concern).
> >>
> >> Pipe fittings are a bit different, since they seal instead of clamp, so
> >> the feel is completely different. Most people tend to vastly
> >> overtighten them. "Hand" tight, plus a quarter turn is probably a good
> >> start. If it leaks, give it another quarter turn.
>