alu temp housing, other senders?

[wimwolf]

Hello all,

I will replace my plastic thermosstate housing with a alu one for my syncro.
It will be used on a late 1.9 DG. The old one (pvc) has got 2 senders with retaining clip, 1 for the gauge in the dash, 2nd is a switch to cut off preheater element from carb.
I notice now that the alu housing has got 2 threated holes for screw-in senders. I already found one for the indicator in the dash but do anyone know if there’s a screw-in switch sender for the carb?

The only one I find is the one used for the ECU but no ECU on my engine, is this a switch or a sender?

Thanks again.

Wim,
Belgium