Hello All,

I wanted to give an update to confirm the type of bulb that was required to be replaced to illuminated the time and temperature readings. It was not a "rice" or "wheat" sized bulb that your wrap the copper wires around the bulb holder. Instead it was a standard bulb that Volvo sold. The bulb comes in a black plastic plug that has "wings" on the side that fits into a slot in the instrument panel. It is manufactured by "Osram" with "12/1.2" written under "Osram". The part number for this bulb (per the Volvo dealer invoice) is # 989806. The bulb lists for $4.34 each, as a member of the Volvo Club of America I was afforded a 10% discount resulting in a reduce cost of $3.91. I removed the instrument cluster and in turn replaced the bulb. I now can read the time and temperature as night for which I am thankful.

Thank you to all who responded to my query. I hope my response proves helpful.

Hugh

Don't use 12V lamps, they will burn out fast.

You can find 14V grain of wheat bulbs at Ebay
These bulbs are also used in Volvo rocker switches and easy to change.

They come in slightly different sizes by width and you can get different
current draw. The higher current draw are brighter lamps.

You can get more details at CEC or Eico, lamp manufacturer websites.

There are 2 bulbs for the 'computer - time/date' display. Both are the "rice" grain bulbs which I used to buy at radio shack. They are inserted into a bulb holder, which is then inserted into the hole and given a 1/4 twist.

The actual power supply from your battery can be up to 14.5V if you turn the display to full brightness, but the bulbs are rated at 12V. You see the problem?

This is the bulb you want: a T-1 12V .06A, #7219

Sample:
https://www.bulbtown.com/7219_Miniature_Bulb_Wire_Terminal_Base_p/7219.htm

Radio shack used to have them, but Radio Shack is gone...
BTW, the copper leads are cut to size as they are much too long.
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Keeping it running is better than buying new