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Well I might say that oil temp or pressure is better than volts. I would probably do temp, its a crucial condition of how the car is performing and you can actually gauge pressure from temp readings if you know what range temp if normal on the gauge. If the temp gets to high you know your going to be loosing pressure. Or you could use the pressure gauge and have a warning light hooked up to a gene burg dip stick temp sender. Thats actually what I'm doing. I got a temp and pressure gauge but decided to not use them right now. I'm just hooking up three led's aside from my tach/speedo/fuel. One for turn signal, one for gen/alt light and the other for the oil pressure warning. The oil pressure warning light will have duel functionality because you can hook it up with the temp dipstick so that the light flashes when oil is passed a point or stays on when pressure drops.
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