blinker relay prob
"Blinker relay"
It's called a "turn signal flasher" and a "hazard" or a "4 way" flasher"
Pull the flashers out of the car and see if the problem happens in the morning?
Maybe it's the time delay relay?
A rally dash has no separate instrument voltage limiter, it is inside the fuel gauge
Has anyone installed some option, alarm, etc?
A assume? from your user name this is a 70 model year?