Tachometers

[hovisa@nando.net (Allan R. Hovis)]

I have recently replaced the tach on my 72 B with one of the later models
which connect only to the distributor and not the older current loop type.
It appears to work fine but somewhat sluggish. I can't see any reason this
would not be a direct replacement. Any ideas? I also at one time had a copy
of a file on Smith's tachs which gave the number for a transistor which was
a good substitute for the one in the older type tachs but can not find it.
Anyone have this info?

Thanks