Harrop 2300 supercharger to Optimiser 6500

[mudski]

I know the fitting, I bought a new sender unit when I did the rebuild. Its sitting tight on the peg. The water level was down as when I removed the fitting , lost maybe 0.5 L of fluid and I have the low level 30mm from top of the core - its a cross flow style. Anyway, it goes off off road especially after and during hillclimbs, given up trying to bleed this pig.

Yep the fitting was tight on mine too, but i had run out of ideas and this seemed to fix it. Mine rarely went off during hill climbs or off roading, it would just randomly go off. Making me think it wasn't just low coolant.