There numerous ways to a low coolant warning alarm, this is what I used for a replacement expansion tank, they are better made than the MG one and are fitted with two prongs for sensing the coolant level, some vendors include the plug and a length of wire as this one does.
https://www.ebay.co.uk/itm/226363474782?_skw=vw+expansion+tank&itmmeta=01JA3JG9YZJFVYNNNCXPKHAFAC&hash=item34b450835e%3Ag%3AKZwAAOSws3tm7qjR&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKk071oMmG7f0uUoSOex6wwz0aL0KUPxZ132nymjf6x844i4P7BX%2FcH%2BbtUWxtWRJzIoypzVWO6J8o93REM3gLErej4UwkSkYibtXZdLaiDWjpz9k%2FswndKlaAshCSYTskwmRQv%2BzMhtUfKmIeILagllK7rSAcVnr%2FDWteBPVfFFyS0QuaGizlC1tybii5pR2ErEZKUjVxNOAL6zmg0xFJ%2FzeWLX9znobuTTNYOGI0boUVoA8pSNk3%2BxMb85zckXlh5nFAbQDM2sUjevNUW8eBTGKWbcN15%2BAMdGFQM%2Fv4SYcQ%3D%3D%7Ctkp%3ABk9SR9ifwfLQZA&LH_ItemCondition=3000
I used the LOW water level version of this HIGH level alarm;https://www.ebay.co.uk/itm/122028782005?_skw=high+water+level+alarm&itmmeta=01JA3HVM6FG84BJHFEKAC4SKQA&hash=item1c697b71b5:g:0iwAAMXQ1ZhTfRmM&itmprp=enc%3AAQAJAAAA8HoV3kP08IDx%2BKZ9MfhVJKkL%2BXvSK%2B23wGxG6YBLzXSYDT8B6WEEuVkFZg7YtRH2ZJpXrSJpWdzvlfl9E%2Fvgncdkd0DLh%2BZPAzX6%2FCt1qB59LnAsD2l9f1CcI9nKwatHi3A88Bjwie7Litl%2Bzs8UkF%2ByMp28hgbqjfYs0bPAobV1wDpZ%2FxD7CRWwvYJZ9%2FmVt6Ddidn8R%2FL2pIb0a7Yq1dQui%2BCpvgCPBFrlKrCE6w7%2Fz3UiXlwRZo%2Bex2ITb6id%2B0pjtBS%2FSMqm%2FrOxeG%2BTDjrEMsjrDHs9zpxas6ax614QE2NTcS8xBJBE0VKLhaWJhQ%3D%3D%7Ctkp%3ABk9SR7zD7vHQZA
The seller will list one if you ask, because I have lost all of my high frequency hearing a buzzer is of no use to me but they do make one with a buzzer. Installation is simple, after mounting the tank with a short strip of metal for a bracket, you then connect the two white wire (they need to be extended to reach) to the expansion tank plug, then a source of power (I got mine from the USB charger that replaced the cigarette lighter) and fit the warning light. I placed the light in one of the switch blanks in front of the gearlever, when the LED flashes in alternating colours you will certainly see it. I got the idea from someone on the MGF Register
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