Several years ago I connected the MS125 spectrometer to a 12 inch Meade LX200 telescope to test its suitability for recording stellar spectra. In order manually to guide on the star’s image the Oriel Sighting Optic was employed which you can clearly see in the photo here:
Exposure times were limited to under 5 minutes and several spectra were multiple integrations of 0.1 second exposure in order to build up each spectral acquisition.