seen what sensor it uses, the bosch ls4 is the more common but i was told there a little dated and fail quicker

the AFR i got uses a NGK sensor,,,, its not a better sensor though but seems to be more reliable,,,,,, if you ignore the fact its 3 times the fucking price ( and i dont sell NGK stuff but am a bosch agent,,, ARGHHHH )

alot of the newer ones seem to work very well,, think the last 4 years have seen the products more accessable and better

remember that oily engines ( the ones that burn oil ) can cause sensors to fail very fast same as leaded fuel and something else,,,, though cant remember as ive not got it wrote down at home pmsl

mines a cheepo one,,,,, but like any gauge aslong as you know HOW it reads then when its off you notice ( my oil temp reads 70 degress when warm,,, thats too low but i know its up to temp so know where to look when its off )