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I put something similar on a VW Beetle years ago but the low-pressure trip point was too low (~5psi) to be useful -- by the time it got that low you were dead anyway. Still, it would be interesting to get a measurement of the trip point.
As a comparison, my home-made installation trips at about 15psi. It doesn't come on in normal operation (might blink a couple of times at hot idle, until the ELR circuit brings the idle into spec). If it does come on while driving I immediately know I've got a problem yet there's still enough pressure to give me a couple of seconds to safely shut down the engine.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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