Calibration

[Charger1970]

I know the speedometer can be calibrated, how about the fuel, oil pressure and temp gauges? Can they be calibrated, also?

[Chryco Psycho]

the needles could be bent making them read high or low , or the sender may be out of range as well

[Ghoste]

If one had the patience and time, I suppose you could measure resistance in the various circuits and add resistors as needed to bring the guage into the range you want.  I think it's a compromise with the old analog guages though.  The senders are all a variable resistance of some type to begin with so your best bet is likely to make sure all the electrics are working perfectly.

[Nacho-RT74]

 if you want to do it by yourself I think you can feed the gauge with 5 volts... needle will go up. Once you get the max read, you will notice that on back of gauges are two holes and tou will be able to see some theet throught them. those theet are movable since they are stitched to chassis and are the support to the bimetalic stuff inside the gauge what moves the needle with heat. just move one or the other one untill you get the right higher value on gauge ( the last mark ).

I never have done it, but I think is on that way shops made it.