Originally Posted by Tbirdtony
jagsfan811 - The gauges are powered from a constant voltage regulator (CVR) which steps the 12 volts down to 5 volts for the gauges. Putting 12 volts on the gauges can burn them out. Do not purchase the reproduction CVRs that are sold by most Mustang parts suppliers. They are made in China and only work for a very short time and then fail. I bought one and it worked for 20 minutes. As someone stated above, there are solid state CVRs on Ebay for $25.00. I have one in my 66 Coupe. They work great.
The instrument lights have no connection to the gauges. The instrument lights work on 12 volts and are adjusted by the dimmer on the light switch.
Thank you for the clarifying. would i need to take off the dashboard to access the cvr? is that usually what wrong when none of the gauges work? including the fuel and speedometer etc. for some reason i thought the oil temp worked but it could just be sitting in the middle
Also not sure if this is connected but the brake light is always on even though i know its not engaged.