Re: Temp Gauge or Overheating??
38 year old gauge + old sender = inaccurate and/or inconsistent reading. Aftermarket senders rarely match what the gauge is expecting.
Assuming a motor is properly full of coolant, it takes one several minutes to warm up from a cold start. Your cold to hot in 60 seconds pretty well means something is wrong with the gauge/sender/wiring.
On a stock motor, there should be a 2nd sender port on the passenger side that you could use for an aftermarket temp gauge. Above the back two plugs like the normal one is above the front two plugs.
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