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Time was, it was all there was. Electrical gauges didn't really appear until the late 60s. There are those who insist the mechanical gauges are more reliable and more accurate than the common electrical gauges.
On a 914, the main issue would be running that pipe all that way. Different issue on a front-engined car.
And while it sounds awful to have high pressure hot oil piped into the cabin, think of how unpleasent it would be if a heater core sprung a leak and allowed 15psi 195dF water into the cabin on the average water-cooled car.
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