The speedometer, temp gauge and oil pressure gauge are intermittent. It seems to happen when the truck heats up, not overheat, just after it has been running for a while. I can be driving down the road and all of a sudden I have lost these three gauges. The kicker to this, is that I can turn on my signal lights and sometimes it starts working again. In addition to that, when I use my signal lights, it sometimes quits working too. Any help on this matter would be great.