I agree with Dennis, it's a "time to replace the engine" buzzer, or at least to add a real oil cooler. Then if you keep getting buzzed start that engine replacement fund!  Don't blow up your 2.1. I see Go Westy is "paying" $200 in Go Bucks for long block cores.  They are getting scarce.  http://www.gowesty.com/view_page.php?name=Core%20Buyback%20Program 

Dennis wrote:

"Having only the low pressure really means that at speed it is no longer an oil pressure warning indicator but a replace engine indicator. Unfortunately the engine would let you know something was wrong by the strange noises, loss of power, the sudden smoke screen as a rod exited the case."

Stuart, BTDT