hi glen,
not sure, although the orion mini autoguider/scope combo reckons it is only suitable to a max of FL1500mm
http://www.bintel.com.au/Astrophotog...oductview.aspx
- the guidescope is 50mm vs your 60mm.
an OAG has other benefits such as reducing flexure. so it may be worth considering moving to an OAG anyway. although you will need a good focuser to hold the additional weight.
cheers
rusty