It cannot get much cheaper than the led setup in the later post. Especially if you gather up an oil presure switch from a volkswagon wreck. I wonder if the gentleman might mention how he handled his coolant overheating indicator as well.

The oil pressure gauge is just not good enough as it is imposible to observe it continually. You want to know almost instantly when the oil pressure sags on 123s anyways. A minute later is probably almost a minute too long.

We have a case here where an engine saved on occasion has got to be worth a couple of dollars and some time. The horn system can be economical as posted by Hunter as well.

Although I found a slight delay getting by a very loud horn type blast in a car with an audiable system. I nearly left my seat I remember but at the same time you could not miss it.

Blinking leds may be available in different wattages as well. Perhaps the brighter the better within reason. Anyways that installation of the leds near the cluster gauges almost looks factory.

The option and it is not really nearly as adaquate is to keep your oil lines in decent condition. I think why almost all oil line failures occur on the highway is simply that is when the circulation thermostat is open for the oil cooler.

A combination of good oil hoses with some form of low oil pressure warning device better than just the oil pressure gauge is almost mandatory. Cheap decent replacement engines may soon become harder to find. Plus who really wants to landup changing an engine because the hoses are neglected and spending a few dollars on a warning system could have prevented it.

There have been enough people lose their engines this way. That it is not an over reaction to do something that lessens the chance of you becoming another one of them.