Peter,
The Smiths fuel sending unit is just a variable resistor - for the six
cylinder Healey is 0 (empty) to 90-100 ohms (full). The temperature
sensor is not the same - the bulb and the capillary tube are filled with
ether that expands with increasing temperature. I assume that there's a
Bourdon tube in the gauge which deflects causing the needle to swing.
I'm a bit confused as the Smiths/Healey fuel sending unit ought to be in
the petrol tank, not on the Holden motor.
Cheers,
Bob
Peter Linn wrote:
> G'day list
>
> I'm now looking at getting the V6-engined BN1 wired. Doesn't look like being a
> huge problem, but it may be difficult to get the Smiths fuel and temperature
> gauges working with the existing sensors on the Holden motor. This is all a
> mystery to me, but my auto electrician says it's down to the impedance range
> (Ohms) - for example, the Holden sender works at 40 Ohms (full) 97 Ohms (half)
> and 280 Ohms (empty) Does anyone know these figures for the Smiths fuel gauge,
> and, if it works on the same principle, the temperature gauge? Or is there a
> way of recalibrating the Smiths gauges?
>
> Cheers
>
> Peter Linn
> Brisbane Oz
> BN1 Ward Spl coupe
> Bn1 Holden V6
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