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?