IC for RevCounter (Spitfire?)

[Michael Syré <syre@parcival.wirtschaft.fh-aachen.de>]

Hi,

I've got an old Smiths RevCounter at the TechnoClassica in Essen, Germany.
I think, there is an damaged IC in it.
It is a TexasInstruments part and signed with the TI-logo and: 

        MICI
        2/C
and crosswise 7223 (maybe the 23. week of 1972???).

On the inside there is stamped 810P 
The RevCounter was produced for BritishLeyland's Triumph Spitfire(?). 

I need a new IC to use the RevCounter in my new(old) '73 Mini 1000 and
hope, you will be able to help me.

Best regards
Michael Syré

72TR6 U1267 sapphire-blue
73Mini1000 tuscan-blue