There is an adaptor on the market and ebay where you can fit it to the top coolant hose. It consists of an alloy casting tapped to take a sensor. You cut the top hose and fit the adaptor using jubilee clips. Then just wire in an after market guage. It's an easy and relatively cheap conversion to do, and pay's dividends especially with the large number of cars being produced without coolant guages. I've done this on Peugeot 106's and some Ford Ka's with good results. Just remember if doing it yourself, the 106 and Saxo cooling systems can be a pain to bleed.
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