The new gauges are manufactured by STACK. The temp gauge came with all the fittings for the sensor to mount to the engine. The quality of the gauges and senders etc was very impressive.
I had originally fitted a SPA digital water/volts dual gauge (both read outs in one gauge) but the EM pulses given off by the ignition system interfered with the digital gauge wiring and stopped it from working. The new mechanical temp gauge has the benefit of not needing a power supply and having a very fast response time. I haven't wired the backlighting into the gauges yet, a job for another day (fiddling around behind the dash is tricky).
Drilling a new hole for the water temp gauge
STACK Battery Volts and Water Temp Gauges in place