Rich Thomas <richthomas79td...@constructivity.net> writes: > How might one wire a lamp? A switch that is open by the voltage of > the proper reading, which then closes if the voltage drops below > whatever threshold? Do we have any idea what voltages correspond to > the various oil pressure readings on the gauge? I guess a simple > circuit of some kind, with an LED or something that comes on?
Oil pressure switches are readily available. Despite some otherwise (IMHO) questionable engineering, VW engines actually do this well. They have an idle pressure circuit and a high pressure circuit. If pressure is too low at idle, a red lamp illuminates on the dash. If pressure is too low above 1800 RPM or so, the red lamp blinks and a really attention getting, raspy buzzer sounds. You cannot ignore it. They don't have a pressure gauge though, so if the alarm goes off you have no means to verify whether the oil pressure is really low or the switch is faulty (a common problem). Allan -- 1983 300D _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
