Tickling the fuses . . .
Part of regular E-Type maintenance was giving the fuses a little tickle now and then. If you didn't do that then something important would stop working when you least expected, like the headlights. Waiting until then would often result in a blistered finger as those fuses would be hot. One of the more arcane bits of design on that car is the way the middle panel on the dashboard hinges down for access to the fuses, small instruments and switches. In some respects this is a great design, particularly for a car prone to electrical gremlins, since it takes no tools, only unscrewing two thumbscrews, to drop the panel down on its hinges. However, if you don't take a screwdriver and remove the fiddly little plastic panel below (this lists what the switches are for) you'll crack the latter, something virtually impossible to not do on a dark night when the lights have failed . . .
After having the '65 E-Type as a fun car for a number of years back in the '80s my sister found a '66 Corvette convertible. Compared to the E-Type it was rattly, thirsty and had mediocre steering, but it was so reliable that it ended out being in virtually daily use. When it was about 30 years old the headlights did quit one night but it turned out to be nothing more than a loose plug on the firewall. I can't even remember where the fuses are in that car since they've never given any trouble - GM knew how to do electrics back then.
Those VDO gauges so beloved of German makes are OK, but IMO not up to the quality of old Veglia or Jaeger gauges - I'm trying to think if I've ever had a failure on a Veglia or Jaeger but have seen VDO speedos in particular become erratic and fail. SEV Marchal made good alternators, as did Paris-Rhone and Ducellier. I've had all of them, plus some from Marelli and Bosch; the only alternator brand I've had real trouble with is Delco from the '90s. My mother had a new '92 Eagle and the OEM Delco failed at 17K, the replacement at 43K, both replaced under warranty. Then again at 75K, replaced by me. That one lasted until the car was given to Aids Project LA in 2004 with about 120K on the clock. It still ran well but we just got tired of dealing with Chrysler for parts; once a car was 10 years old they didn't have any interest in supplying parts, something that Fiat will hopefully change. Sad to see Delco go downhill so far given that the old Corvette never had any problems with the alternator in spite of having a ton of miles on it.