instrument cluster voltage limiter

The 7805 isn't exactly 5.0 volts. Even though its a modern solid state piece it aint everything some think it is. At 68 degrees, initial output should be 4.86 to 4.92 . As it warms it'll climb to 5.2 for a normal/average and all those numbers vary slightly with mfgr. It can go 5.4 and more depending how hot it gets. Digikey once substituted the brand I had ordered with some other brand. initial output was in the 4.6s. Yeah, Digikey got a message. In any case, Efficient heat sink is a must.