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If the line broke, I would not attempt to repair it. That's because if it's original to the car (as it may well be), it's a nylon (plastic) piece that's been exposed to heat and 37 years of age. A repair now may result in a break soon afterwards in another location. If it breaks UNDER THE DASH, it will be a LOT messier than when it breaks in the engine compartment.
Your options, as I see it, are these:
1) Replace the line with a new one. As others have mentioned, these are easy to obtain. Installed correctly, they will likely last at least another 37 years. These nylon lines are quite durable. In fact, I think that some of the more recently manufactured lines are made from an even more durable plastic material. Make ABSOLUTELY sure that the line you use has the little brass inserts in either end of the line for the compression-type fittings to bear against;
2) If you're utterly paranoid about the possible future break of the oil line, then you can install the electric version of the oil pressure gauge. Simply install pressure sender GM #15591103 in the same 1/8" NPT block fitting as your oil gauge tube fitting is installed now. Then, install a reproduction of the 74-76 oil pressure gauge in your gauge cluster and connect the 2 with a wire. That's all there is to it. However, be advised that the 74-76 oil pressure gauges have white lettering whereas your 1970 originally used gauges with pale green lettering. So, the 74-76 oil gauge will not exactly match your other gauges. However, they will otherwise adapt perfectly to your gauge cluster.
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