How to retrofit equipment of vibration on LM2500

We got a LM2500 Gas Generator equipped with:

One accelerometer 50 pc/g ENDEVCO

One remote charge amplifier DSC Vibrometer, very obsolete.

The output of this amplifier (velocity) is directed as input to Speedtronic Mark V.

The Remote charge amplifier is powered by Mark V +15vdc -15vdc

I need help with how to retrofit this circuit from accelerometer to remote charge amplifier. Does anyone have an example? Thanks for all.