The flasher unit can be exchanged for each conventional 3-point indicator relay or also attached by single wiring. The indicating time can be selected by the rotary switch, startting with 15 sec. at position 1 and incrementing 3 sec. at every step. Position 0 means continuous flashing like a conventional relay.

Only use interference-free spark plugs!
(recommended NGK caps with 5kOhm internal resistance)