View single post by Mark Rosenbaum
 Posted: 02-16-2006 05:54 am
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Mark Rosenbaum



Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
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 Very probably the number stickers on the backs of the gauges refer to either the person who assembled the gauge, or, more likely, the one who inspected it to make sure it worked correctly.  I don't know of any other significance to them.

For the panel wiring harness, 54960862D is the Lucas drawing number.  The Jensen part number would have been 90843.  Not certain what the 2205 is, perhaps it's a date code of some sort.  The 32 in a U sounds like an inspector's approval stamp.

To test the tach without the engine running, you'd have to provide power for the tach and switch a 4-amp current on and off at the same rate as the points would switch the coil current.  For example, 3600 rpm is 60 revs/second, which, since the engine is a 4-cylinder 4-stroke design, means 120 current pulses per second.  You could do this with some fairly simple electronic circuitry, or you could dismount the distributor and spin its shaft at a known speed with the wiring hooked up normally and the ignition switch in the ON position.