Transistor in rally gauge ?

Like I said I have no clue, but the gent the takes care of the car for me, told me it was the resistor, so I came asking here as I like to learn as much as I can... And from what I have deduced from all your help ( as usual ) is I have to buy me a Vrc 601 resistor I found on eBay. I had to do a search also to make sure that I had the right piece.
Now I have one more question.... Where does this go ? Is this soldered on the back now off the dash guages, or does it snap in somewhere ?

Again I can't say it enough, you guys literally teach me something every time I'm on this site.
Thanks.
MAPS

PS Can exchange free cadaver questions.