The faulty readings and the slow start does indicate a voltage problem.
If voltage is low, your gas gauge will read a closer to Empty.
My first thought ('86 car probably close to 200000 miles) is that the brushes in your alternator may be ready for changing. Or a very loose alternator belt.
The belt can be done quickly, The brushes can be done quickly too except you have to get the replacement brushes.
As Don says below, check your voltage coming off the battery when the car is running, see if the alternator is even trying to charge your battery.
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'75 Jeep CJ5 345Hp ChevyPwr and two motorcycles: it wasn't Volvos safety , it was Longevity that sold me
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