Hello all ,
Sadly the Problem is not solved.
I get my hands on a old Data I/O 288A Programmer which supports 2758 Devices.
I used the old programmer with a really old PC with MS-DOS - but i coud not establish communication with the programmer.
After all i found the solution about the correct Interface cable pinout.
See attachment for a working ! interface cable.
The interface cable which was part of the programmer i got was not working (incorrect pinout).
But even these old programmer cannot read the MSM3758 EPROM.
The ..2758 devices i tried leads to a read error.
i tried several other eproms i have - reads all without problems (& file saving). --> programmer is working correct.
The gauge i have is working --> Original EPROM is intact
Maybe the device have a special Pinout or whatever .
So i am still looking for a original MSM3758 datasheet to narrow down my problem