Some U20 water neck spacers have more than one tapped hole. I put a mechanical
water temp sensor in the race car in the water neck spacer. The oil pressure
and temperature are measured mechanically at the remote filter mount. It has
four ports. Two are used for inlet/outlet and the other two for pressure and
temperature sensors.
On the U20 I tapped the pressure hole in the block to accept an NPT fitting. I
used an aftermarket mechanical gauge and disconnected the OEM one. The factory
gauges are not very accurate. The tach is way off.
Andy
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