I have used these oil pressure warning light switches for years on vintage racing MGs that I build (cars notorious for abrupt oil pressure failure). And years ago I found that these switches are very helpful but don't like to be mounted on the engine. Vibration kills them. Pegasus used to sell a remote mounting bracket that grounds the the one wire switch to the bodywork. No more. I found a mounting bracket elsewhere, unfortunately at a cost much more expensive than the switch!
Skinny Little Boy From Cleveland OH
Grand Rapids, MI