I am wondering what the fourth guage would be in my surburban's dash. It on the lower left side of the four small guages in the cluster. It an 83 4x4 chevy surburban,350-700r4-208 and ten bolts. was it a tranny cooler guage,clock what? where would iget the matching guage? is there a tranny cooler guage that works there that looks like the rest? thanks for the help guys. just bought the surburban to use for a tow vehicle/daily driver.