Topic: Tacho/Speedo rebuild.

[Paul Lowe]

Hi. I am in the process of rebuilding my gauges and do far so good. Gauges apart and happy.

Before I reassemble I want to 100% sure I don't need them apart again!

I do not know the history of the gauges but have been assured by PO they are fine.

Questions:
1 is the oil only for dampening or does it cause gauge to work

2 Or is gauge magnetic driven and oil only dampening.

3 what speed does tacho and speedo actually turn at to give full deflection?

4 where is my 10mm ring spanner...

Thanks in advance.

Paul

[AJK]

Hi Paul,

(1) Oil is for the dashpot and only for damping. No oil just means that the tacho needle may bounce around a bit. The oil/dashpot acts as a signal filter, thus smoothing out any oscillations in the needle.

(2) Yes, it is magnetically driven from what i can tell.

(3) There should be some calibration numbers stamped on the gauge housing. Like 60kms/hr is xx rpms or something to that effect.

(4) Where you put it last

This page may end up being useful to you
http://www.salocal.com/sohc/tech/speedo/spedo1.htm

I forgot to add, DO NOT get oil on that magnet!