I installed "LED Lights" on my 69 -- front & rear.
I 1st used a 'LED flasher from NAPA' # 262 . It worked -- but would flash kinda 'slow' .
I also bought some LED bulbs from "Super - Bright LED's.com" --- they were on here a few years back. Spent like - $ 80.00 - and then didn't even use them ( I used one of those LED bulbs -- for the 'Dome Light'.
But, I did change my Flasher (262) ….. then, I saw the post by ; duggravs in the Electric Section (July 10, 2017).
That turn sig. flasher Works GREAT ; "AUDEW 2pin adjustable - speed Flasher" .
click on the "link" in his 1st post.
I DID BUY that 'AUDEW' flasher ---- IT Works Great …… just FYI
(I also added some 'WalMart LED's strip lights to my front bumper' to use as 'kinda like Day-Time-Running-Lights" -- hooked to my front park lights,