When I start my 2000 V-6 all six gauges (RPM, MPH, oil temp, etc.) peg high for about 2 seconds then peg low for 2 seconds then return to normal. The only repairs I have ever had was the replacement of the alternator about a year ago. I was thinking there might be a relay or switch that is causing the gauges to go whacky on startup. Any ideas on what it might be??

 

Time for a new battery

This is a classic sign in these trucks of a battery going bad. Run by walmart and grab a new one for pretty cheap.

 

your battery is going out, change it

 

X3 - This is called "gauge sweep" and seems to be a symptom of low battery voltage. There are several posts on this in the forums.

- Jack

 

You also need to make sure that the cables (all connections) are clean and tight. Poor or loose connections can cause the same thing.