Heidenhain linear gauge on an early FP-1?

I have a 1950’s FP-1 with the provision for Jo blocks to make precise movements in the three axes (pre-digital). There is a bracket for an 8mm hole over the gauge locations for a very small dial indicator, really not a lot of room. Now I have a Heidenhain VRZ401 (single axis) readout sitting on the shelf. And I see these used Heidenhain ST linear indicators on the internet that would fit nicely into the 8mm dial indicator locations, but almost all of the linear gauges I see on the internet have the 15-pin output. Is there anyway to adapt the Heidenhain 15 pin rectangular shape connector to the round 9-pin connector. Application is the Heidenhain linear gauge ST (TTL output). If I’m on the right track for a low-budget digital readout, are there pin-out diagrams for re-wiring these? Or is this just a dumb idea?

Your read-out uses 11 microamp (11uA) scales with 9-pin connectors. Those are NOT TTL signals.

A common model of probe that produces 11uA signals which you can find on Ebay is the MT series. For example here is an MT-30 in New Mexico (note: I have no connection with or knowledge about any sellers below). The 30 means 30mm of travel.
Dr John Heidenhain Digital mebtaster MT30 | eBay

Here is a smaller unit, with 10mm of travel:
DR. JOHANNES HEIDENHAIN DIGITALER MT10 GAUGE | eBay

I think both of these have 1 micron resolution, which is about 0.000040", meaning 40 millionths of an inch. That should work well as a zero reference for gage blocks.

Here to a good summary document on the different types of Heidenhain interfaces:

https://www.heidenhain.de/fileadmin/pdb/media/img/1078628-22_Interfaces_en.pdf

Pinouts and detailed specs can be found here, for all Heidenhain standard interfaces, starting on page 121:

https://product.heidenhain.de/JPBC/image/FILEBASE_PUBLIC/517651_10_a_02_1.pdf

Thank you Bruce!
You saved me a lot of grief and frustration.
The links are appreciated as well.
Dan

Dan, you're welcome. This might also be useful, it's the VRZ401 manual and the MT (Metro gauge) manual.

One of the nice things about Heidenhain is that they have all the stone-age documentation still available for download. Great for us Neanderthals.

https://content.heidenhain.de/doku/oma_vrz/Oma_Coun/VRZ/400/Gb/23772023.pdf

https://www.heidenhain.de/fileadmin/pdb/media/img/1068623-20_MT12_25_en.pdf