I have a turnigy 1250tg servo; however, my servo saver that came with my old HPI E10 that I'm trying to resurrect will not work with it, neither will the adapters for the hot racing servo saver I had laying around. There's lot of info out there for the big three, e.g. futaba, hi-tec, and JR/spektrum, but noting I could find easily on this turnigy servo.

Anyone here have any ideas on what spline this 1250tg is compatible with, and what servo saver would work with it?

Apparently that servo has a 25 tooth spline so should be compatible with the Futaba fitting. Although I have found that some cheap servos and servo savers have pretty poor tolerances.

Whats the diameter of the futaba spline? These don't seem to fit the 1250tg.

I used to run the Turnigy 1251 servo many years ago and I recall it using standard 25T splines perfectly fine... I did use only "clamp" style servo horns so you get the best fit, here's an example:
https://www.amainhobbies.com/exotek-...547blk/p467028

I have a control arm that came with the 1251tg servo, but I'm using it as a steering servo and would like a servo saver that fits.

This gives you multiple spline options
Kimbrough Mid-Size Servo Saver - 23, 24, 25 Spline Drive, With Holes

Thanks! I'll give that one a try and report back.