As it happens the Dodge ('97 Ram 2500) has electrical gauges but the root cause would still be the same. I put a large chunk of heavy cardboard (waxed stuff for produce is good as it doesn't break down from rain as fast) between the condenser and radiator... blocks about half of it. Isn't good for charge density (turbo intercooler also slightly blocked) but, hey, it's COLD out!
I wouldn't expect a pinched line to cause the wild fluctuations, rather a sloow response, and in effect a damping to whatever is causing the wild fluctuations.
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Mike!
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