These adapters are great if you are a mk1 owner with a mk3/4/5 swapped chassis and are needing to keep that mk1 cluster working perfectly.. Simply install this in one of the spare locations found in the coolant system, attach the included ground wire, thread your sensor into the adapter, attach your original signal wire and boom, a working mk1 cluster again!
They also work for aftermarket gauge installations for the mk3/4/5 owners, install the sensor into the adapter, ground the adapter with the provided ground wire, install into the coolant flange, enjoy an aftermarket gauge in your cockpit!
*sensor thread size is m10x1*
$24.00 shipped in the USA Check them out HERE