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My speedo , Tach , amp and temp gauges ,brake and air bag light all quit working at same time. Oil pressure and fuel gauge still work .

Some of you will remember my thread on my engine over cooling problem that turned out to be the gauge reading improperly. It got worse some time after that and started affecting the way the truck ran. I am going to be tearing into it pretty soon and want to see if any you might have experienced anything like this or just have some suggestions. At the time I was lucky to see the low 170's on the gauge. As long as it stayed there every thing worked fine but some times it would drop into the high 160's and the Banks chip would start operating weakly. The low 160's and it got worse and the gauges(pyro and boost)would act up a little. Some times it would drop into the 150's and below. At these low readings the gauges would just drop out and the Banks would just stop working. I bought a Scan Gauge II and it is reading the same temps as the gauge. There is no rhyme or reason to the temp swings. It can do it while cold or hot outside. Cruising down the interstate reading in the 170.s and then slowly drop into the 140;s or somewhere in between. I installed a mechanical gauge under the hood and anytime I look at it, it reads near 190 no matter what the gauge says. It is installed about midway in one of the plugs in the head. I took voltage readings at the sensor and the sender is putting out the right signal, it is just going crazy somewhere between the sender and the gauge. It finally got to where the gauge would not hardly get out of the the 160's and the Banks chip got so erratic I took it out thinking maybe that was causing. The temps on the gauge did go up on average about 8* but it still swings up and down. I have had this problem for quite some time and it has slowly gotten worse to the state it is in now. Cant seem to find anyone who has had this problem any where and thought I would throw it out here. With all the new members maybe one of you might have experienced it.