Hints and Tips - Hobson Telegage

Date: Wed, 14 Apr 1999
From: Geoff Burford
To: british-car
Subject: Hobson KS Petrol Telegage

The Hobson Telegage fitted to 1930's Rileys and many other British and American cars use a fluid (Tetra bromo ethane) in the Gauge head. The fluid is available with some difficulty but unfortunately it is clear, the original fluid was red. Has any one overcome this problem by finding a way to colour the fluid?

Geoff Burford
1934 Riley 12/4 Kestrel
Melbourne Australia


Date: Wed, 14 Apr 1999
To: Geoff Burford
Subject: Re: Hobson KS Petrol Telegage
From: Mike Maughan

Geoff Burford wrote:
> Has any one overcome this problem by finding a way to colour the fluid?
>

Try a friendly chemist (laboratory, not pharmacist) or biologist for one of the red dyes used as stains for microbiological work - the blue one is bromophenol blue but I can't remember the name of the red one offhand. The dyes are spirit based and will dissolve in the organic solvent you are using.

- Mike


From: Geoff Holmes
To: Geoff Burford
Subject: Re: Hobson KS Petrol Telegage
Date: Thu, 15 Apr 1999

Geoff,

I can't answer your question directly, but I overhauled mine some years ago at great expense (of time) and effort. For the few months afterwards that it actually worked, it was wildly and inconsistently inaccurate. It soon packed up altogether, and the fluid in the head turned a not unpleasant shade of turquoise. I now use a dipstick and a spare gallon in the boot. If you look at the tank unit you will be convinced that the Telegauge was a Bad Idea.

I think I might still have the overhaul instruction sheets, which I can send you if you still persist.

Geoff Holmes, Keighley, W. Yorks, UK
(1933 Monaco).


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