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,

   Found a 200 psi, liquid filled 1.5" gauge at "Surplus
Center".........Price is right..........Would   need to order
several items to make shipping worthwhile.............Link below

   http://www.surpluscenter.com/item.asp?catname=electric&qty=1&item=21-1667

    Kelly Troyer

   "DYKE DELTA JD2" (Eventually)
   "13B ROTARY"_ Engine
    "RWS"_RD1C/EC2/EM2
    "MISTRAL"_Backplate/Oil Manifold
    "TURBONETICS"_TO4E50 Turbo

 Price is good. Is it panel mount or thread mount? Panel mount would have
studs and a bracket to hold it from the back. I am nervous putting mechanical
gauges in a car: Refer previous discussion about Bourdon failures. Also the
nylon tubing WILL fail and dump oil all over. As regards our old buddy Murphy,
that oil will end up on a new carpet or your leg. If a mechanical gauge is
preferred, I would use a stainless braid hose with teflon lining. Best in my
mind would be an electric gauge. A measure of the electric gauge volts and
amps and match up a transducer to make it work. Some can be calibrated.

Dale Davies