> Hi All-
>
> Now that I have my newly-updated EC2 and EM2 back in place, I wanted to
wire
> in the O2 sensor to enable auto-tuning mode before I try for a startup
> again.  The suggested O2 sensor, unfortunately, requires a 18mmx1.5thread.
> A tough tap to find.  Worse, it requires a 16.5mm pre-drill -- even
harder
> to find.
>
> Anyone have any suggestions on how to get my hands on either/both of
these
> without spending an arm & a leg?
>
> Mark (Rocky mtn high)
>
> Magic words are Metric Hand Taps http://www.mcmaster.com/ Cost one arm.
>
> Magic words are Metric Drills http://www.mcmaster.com/ Cost one leg.
>
> Or if worse comes to worse a 41/64th will work.
>
> Also try Enco or Airgas or Rutland Tool and Supply
>
> Don't forget to make a quart vac can to smooth out those intake  pulses.
>
> I'll stop in on my way back or too OSH (Tuesday next week) and help out.
> It will help if you have or can rent a scope. We can take the lid off
Tracy's computer
> and put a scope on the output wire of the pressure sensor. Or we can
> buy a pressure sensor and feed it some power and use it to monitor the
pressure
> pulses. Or I can bring my computer and power it up and connect to that
pressure
> sensor. We can tee off the pressure hose.
>
> Paul Lamar ...No rotor no motor.
>

For the O2 sensor, I got a "bung" that I welded into the exhaust system.
It's the same thread as an 18MM spark plug.  I think I got it at NAPA,
but I'm not sure.

Bob W.

Thanks, Bob -- the bung is clearly the way to go!

Paul - I have a choice of a steel bung for $5.95 & a stainless bung for
$6.95.  Any reason to pick one over the other?  (In terms of weld-ability I
mean).

Mark (Rocky Mtn high)

Go with the SS. Do you have a scope? I might be able to bring mine
if not. We need to get a handle on this intake pulsation problem.