Hi,
I will share some answers I found on my own.
https://photos.app.goo.gl/w9NEQkg5NCAbbQDh8 is blinker relay/intermittent connector (mate-n-lock universal)
https://photos.app.goo.gl/Yx3yd6PVQCKdCjJk6 is main connector with most of the signals on it including headlights, indicators, fuel gauge etc. Useful for dash indicators.
multi function manual and wiring is available here
http://www.acewell-meter.co.uk/User%20Manuals/index.htm (ACE-38XX). Mind that wire colors may vary.
1900RMP idle is fine.
[
https://photos.app.goo.gl/rMjEz92G91SjYmi36] this is a Molex connector - matching one is p/n 03-09-1032
https://www.molex.com/molex/products...P_HOUSINGS.xml