why does are temperature guage only go up to 120 ? what reading is that in celcius i guess, but what is 120 celcius in farenheight

 

120* celsius is around 265* farenheit. No you don't want your guage reading that high.
A good rule of thumb for converting C* to F* is to double the temp and add 32. This gets it close.

Bob

 

'F = 9/5 * 'C + 32

 

And since this is a thread about temperature guages, let me remind everyone that the temp sensors in our cars are tremendously non-linear. 160 is right whe the needle comes off the first tic. 190 is just past the mark between the first and second