Voltage drop reading on guage '83 Coupe

[Ben Swann]

Subject: Voltage drop reading on guage  Vehicle:  '83 Coupe possibly others.

Is it normal for the voltage reading on guage to read about 1-2V lower than battery voltage when accessories are turned on, in particular the climate control fan?    This car registers significantly lower on the voltmeter than at the battery.  

Battery reads 12V with engine off.  13.7V +/- .3V varying at idle.

Voltmeter reads: about 11.5 with engine off.  Engine on, no accessories around 12.3.  When flasher operated, there is a noticable flicker in the guage needle.  As other accessories are turned on, the flicker becomes more pronounced.  With lights on, guage reads around 11.5 and when fresh air fan is on full, down around 10.5.

I know this is probably not a significant problem, but is there any good workaround?

Ben