Temp gauge help

[s10mk]

Hello,
The temp gauge in my truck wasn't working, it was pegged hot all the time. and I think I found the problem. The 90 ohm resistor listed in the picture is reading infinite resistance, or open loop. So basically, the gauge was not able to ground itself. I jumped the two terminals with a 1000 ohm resistor I had lying around. And it began working somewhat normally.

How important is it to find a 90 ohm resistor? Would a 100 or 200 ohm resistor do the job? I noticed in the picture that some models don't use a resistor in that spot. Thanks!