I put a vacuum gauge on my 25 at Bushwacker's suggestion. Best, most useful gauge I had.
On the oil temp gauge: My 300 hp Volvo 5.7 did not come with an oil cooler. I put one on(and an oil temp gauge) before I started using it and the oil temp was still on the high side. Stay above 7 inches of vacuum(to keep the exhaust valves from burning) and all was fine, but not if I exceeded that vacuum. For sure, that engine would have been running too hot without a cooler.
Running too hot on oil temp once cost me an engine, so I'm a bit sensitive to that issue.
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