40 psi +
Hi All
I'm using 1/8 inch copper and plastic on 235 and 261 engines which run 42+PSI on the pressure to the gauge with no problems. With the non 216 engines 5-20 PSI 1/8 copper works fine on the 235 & 261 engines with higher oil pressure I've installed a T and a second gauge with higher range to monitor oil pressure.
The original gauges, early design, just hit the pin at 30PSI while the second gauge reads around 42 PSI, the original oil gauge has been being over pressured with no ill effects for years.
Cheers Phil
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