'91 V8 questions

[Duane Hale]

Picked-up an amazing '91 V8q over the weekend and have a few questions:

1.  The MPG readout fluctuates greatly (ie; 12 to 135...) Cause?

2.  The radio must be manually turned on/off.  Normal?  Fixable?

3.  Are the telephones in these things worth keeping?

4.  Illumination for the driver's air vent is_not.  Is the bulb easily
replaceable?

Thanks for any answers/tips you can provide!

Duane
Alexandria, VA