I believe you can use any guages on any engine. In the case of the Tach, you need to have the tack set for the same number of poles as the alternator poles. Other than that I cannot see any reason you can't use whatever type/brand you want. About the only one I can think of that you might have a problem with would be the tilt/trim guage, not sure how specific that is to the original ... 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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