I found an additional article on the conversion from TR Drivers Club magazine.
It shows all the details of the conversion and says the following simple
procedure for the modification.
A) Examine the rear of the tach. It should be possible to see four components,
which look like 'liquorice all sorts' standing on legs!!!(see fig 1). These
components are 'capacitors'. The capacitor on the right should have five
coloured bands, brown, black, yellow, black, and red, reading them from top to
bottom. Locate the 'leg' of this capacitor, which is closest to you when viewed
as shown in Fig1.........Fig 1 is a picture of the tach sitting on a table with
the face up and the row of capacitors facing you.
B) To the right of the capacitor located in (A), there is a red wire which is
soldered to the thick film, substrate. (i.e. the ceramic base to which the
components are soldered). Locate this connection.
C) Using tweezers. cut and bend the leads of a 47 kilo ohm resistor (in a U
shape, so that the ends will touch the leg of the capacitor closest to you and
the other end will touch the red wire connection)
D) Very carefully solder either lead of the 47 kilo ohm resistor to the leg of
the capacitor closest to you and the other lead to the red wire connection.
That's it other than painting a new red line on the face of the tach at 5500
rpm
Paul MacDonald
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