#2 OBS, what would you do?

Our #2 OBS is a KI-201C. Our avionics guy rescued it when it turned
out to be inop after we bought the plane, by soldering in a $10
capacitor or some such, and it worked flawlessly for about 5 yrs.

Now a 10 degree change on the OBS only produces half deflection.

This time same avionics guy can't find anything to fix (so far).

Our set-up is #1 KX-170B w/ glideslope receiver, KI-206 (I think)
#2 MX-170B, KI-201C
Apollo 2001 GPS (IFR approach certified), Mid-continent CDI

We're contemplating our options. Replace #2 with a KI-214 (integral
GS receiver) so we have two LOC/GS? with a KI-209a/external GS receiver
so we have 2 LOC/GS but also something which might be capable of VNAV
at a later date?

Leave out the #2 OBS altogether and fill the hole with an electric
horizen gyro? We can identify intersections and back up the loc
with the GPS...course it's less precise...

Other alternatives we haven't considered yet...

Thoughts? What would y'all do?

Cheers,
Sydney