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Fixed price repairs are based on the assumption that unit/s received
 are
‘original & complete’... a surcharge may be applied to cover
missing  parts etc...  If in doubt send in the unit for inspection
Good  luck with your project’...  Enjoy your classic motoring...
If  you  found this web site via a ‘search engine’ please
 check that you are looking @ the
latest version... click here
Mileage correction
Clocks
Other services
Post & packing
Contact details
Speedos
Rev counters
Jaguar XK 120 ( 1948 / 54 )
561.1 M
Parts Order E-Mail Link
Payment options
Payment options
Payment options
Payment options
JDO Instruments
Classic Car Instrument Repairs ( Est 1963 )
Fixed price repairs for most British & European Classic Car Instruments
48hr service  available... Why pay more & wait longer ! No UK vat
Tele:   01535 603570 / Mobile: 07872 071512
Please check the  FAQ’s page  BEFORE ringing / texting / emailing
WE ARE STILL OPEN  ( for postal work only )
Connecting diagrams... Smiths & UK Jaeger Rev-Counters
Type RVI v1
Current loop
( 1 full turn )
A
B
C
Positive  OR  Negative Earth*
A= Ignition feed  - ve.. (+ ve)*
B= Coil - ve. (+ ve)*
C= Ignition feed - ve  (+ ve)*
Case to be earthed + ve  ( - ve)*
If unit fails to work  REVERSE
A & B connections
These units will not work
with Electronic ignition

upgrade available
(See picture @ top R/H side
For ‘current loop’ info)
A
B
Type RVI v2
Normally Negative Earth*
A= Male bullet  Ign +ve
B= Female bullet  coil +ve
C= Ignition feed + ve
Case to be earthed -ve
* A few early units were
Positive Earth
These units will not work with Electronic ignition
upgrade available
C
Type RVC
A
B
Negative Earth only
A= Male bullet  Coil - ve
B= Ignition feed  +ve
( positions may  vary )
Case to be earthed -ve
These units will  work
with Points OR
Electronic ignition

Some Jaguar units may be fitted with a lead
& a 3 or 4 pin plug
A= Camshaft generator
B= Camshaft generator
( either way round )
Case to be earthed
( for illumination only )
These units can be
Upgraded to work with
Points OR Electronic

ignition
A
B
Type RV
Current loop
( 1 full turn )
Positive  OR  Negative Earth*
A= Ignition feed -ve  (+ ve)*
B= to coil -ve  (+ ve)*
Case to be earthed +ve ( -ve)*
( for illumination only )
If unit fails to work  REVERSE
A & B connections
These units will not work
with Electronic ignition
upgrade available
(See picture @ top R/H side
For ‘current loop’ info)
A
B
12v -ve
6v -ve
+ve
Type RVI v1 ‘Universal 80mm unit’

RVI version 1... It is important to retain the nylon block correctly  with  the metal clip
&  loop the ‘pulse lead’  as shown  otherwise the unit will not work

 

For other Smiths / UK Jaeger instruments

Connections...    CLICK HERE

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