Just a redundancy system, like Toyota does with everything else. Maybe in Japan it is/was common to ignore the first idiot light, so Toyota designers figured they better add another. <img src="/forums/images/graemlins/lol.gif" alt="" />

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed