Altitude Hold for 1962 M20C

[Van Lanier]

Has anyone installed an S-Tec/Cobham 30 ALT Altitude Hold (only) system in their Mooney?  I have an antique ARC-AF 512B factory installed autopilot that, believe it or not, works fine in heading and GPS tracking modes.  I would like to add altitude hold, as I am getting older and finding that manually holding altitude on long cross country flights is a bit tiring.  

I know -- I can get a GFC 500 with GI-275s, an engine monitor, new audio, new panel, etc. for $55K or so.  But, I don't need the world's most expensive M20C.  

Many thanks.

[MikeOH]

I'm afraid I can't help with any install experience.

However, I purchased my F with an STEC-30 with ALT already installed and have been very happy with it.  Stable, no porpoising.  And, have had no maintenance issues in 7 years.

[Greg Ellis]

15 hours ago, Van Lanier said:

But, I don't need the world's most expensive M20C.  

Many thanks.

Actually, I think I am in the running for that….

[Jim Peace]

I have a C with the Stec30 w/ Alt hold.  It hold altitude to the foot.....very happy with it....

Came with the airplane...