Good news: works great in my '67, provides adjustable flash rate.
Bad news: It's silent, no tick-tock sound. That was neat for a bit, but I missed that audio feedback. I added 2 cheap parts to make some sound.
The NOVITA EL-12 works great and it has an audio turn signal alert. Company is owned by Sylvania and products get good reviews.
65 Corsa 140/4
66 Corsa 140/4
66 Corsa 140/4 w/factory A/C
66 Corsa 455 Toro V8
65 Monza Convertible 110/4
66 Monza Convertible 140/4
65 Monza 4DR 140/PG w/factory A/C
65 Monza 4DR EJ20T/5