Just a little nugget of info- Just this afternoon, I took a longish interstate drive and at a sustained 4.5K-5K(80-90mph) the temp gauge settled at about halfway between "N" and "H." Slowing down to about 4K(a little over 70mph) would allow the temp to drop to "normal" operating position which I think is roughly 190º(thermostat rating). In any case, it was hot enough that apparently the radiator cap popped and let some coolant out into the overflow pipe. When I pulled into my garage, it was still dripping a bit, and after cool down the coolant level was low. This is not the first time I've seen it, and as far as I know it's not unusual since there's no expansion tank-I'm thinking I'll jerry rig one-I've seen a fair number of MGs with a milk jug or something a bit more elegant in front of the radiator with the hose from the radiator running into into it. The radiator hoses are tight and there are no other obvious where coolant would leak. I wish I'd been able to measure oil temps when the engine was that hot-I suspect they may have been over 180º but am not sure. The next time I measure, I may thread a thermocouple down the dipstick hole rather than just shooting parts with the IR thermometer. I was at about 55psi of oil pressure at that temperature, although it dropped to 50psi at 4K with the temp up(the 4K oil pressure went back up to 55 when the engine cooled). I've actually looked at some Glowshift products and at the expense of looking to "ricey" they do make some nice gauges along with a 3-gauge cluster that fits in the radio slot. I currently have a blanking plate there. My main interest is in an A/F meter(something that's actually useful on a carbureted engine), but have considered a voltmeter and oil temperature monitor to fill the other slots. They make a "sandwich" adapter that fits under the oil filter and allows you to screw in a thermistor.