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

--

Guys,
the hole is close enough to allow running a 1/8-27 npt tap down to chase it
and then it will work. The trick is to grease the tap so the particles will
stay attached to the tap (or do it when the engine is torn down). Proper
depth of the tap is 2/3 of the length of the npt tap.
Larry