Hijack:
Yes, the outside temp display is replaceable. If you get one from the salvage yard, depending on the month your car was built, you might have the 4 or 5-pin temp display unit.

The 5pin is the late-'87 (9/87 on) display.

You can use the 5pin, all new replacements are the 5pin.

Buy the display from the salvage yard, get a 5pin unless you are SURE you have the 4pin. When you buy the display, get the plug/pigtail also, you will need it to reconfigure your wires to fit. The 5th wire (pin 4) is a speed-sense wire, if configuring a 4-pin car to fit a 5-pin display, you don't use it, it will be fine.

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Gone to the dark side

- Jeff