I installed the dash gauges today on my 74, when I put the hazzArd on, the indicator works fine, for left and right the indicator only blink once qnd stop.All lights are working. My tails lights are disconnected.

connect your tail lights. the circuit relies on the proper load to work.

Problem solved .
For those who may have the same issue, if your tail lights are disconnected or one of your turn signal bulb is blown, the indicator will not work for the blown side.

Good info, thanks for posting!