Dave Leonard tells me his VDO pressure sensors are not living more
  than 20
  hours so he is replacing them with a mechanical oil pressure gage.
  Needless to say the oil pressure is critical to the life of the engine as
  well as Tracy's gear box.

  These are AN -3 brake lines but they will work as a reliable and
  robust oil
  pressure gage connections for  a MC Master
  1.5 inch OD oil pressure gage. Yes one and a half inch outside
  diameter oil
  pressure gage.

  https://www.pegasusautoracing.com/productselection.asp?Product=3

  You will need a jic steel NPT 1/8th pipe adapter to the gage and to
  the -4
  an line.

  We are not happy with the automotive oil pressure gage and it's nylon
  lines
  that are in there now.

  Paul Lamar
  --
  Paul,
  Are you familiar with the trouble almost ALL 3rd gen 13Brew engines
  had with
  their oil pressure senders/gauges? I've had 4 fail. Remote mounting is
  one
  answer (with good grounds). Also aftermarket senders don't seem to be
  up to
  the start up pressure and leak soon after new.  I always have a back
  up oil
  pressure gauge in my rew's.
  Also, the threads on the block are something odd.
  Marc Wiese

  I think those threads are 1/8th NPT. That seems to work.
  Larry Child looked at the sender and instantly recognized 1/8th NPT.
  I assumed it was metric but no.... it is 1/8th NPT.

  The high start up pressure was the reason I choose a 200 PSI
  gage.

  Paul Lamar


IIRC, some RX7s use a 1/8" BSPT or 1/8" JSPT (can't remember), it is
slightly different than 1/8" npt.
I can't remember if the BREW is the same.  It may have changed at some
point.

Cheers
Cary
----------------------------------
3rd gens -rewtt- (93-2000) for some reason DID use the British Standard Pipe
threads! You are correct! 1/8 npt will wobble a bit if threaded in.
Marc

--


Marc,
That is British STRAIGHT Pipe thread. It isn't tapered like NOT.
Bill Jepson