long story short,when i was putting in my sending unit in the block,i broke the head off the unit.luckily it capped itself off so no leak. couldnt ez-out it.

so i bought a radiator water temp adapter,im using the factory sending unit and wire cap running into my Autometer Electric C2 gauge.
the silver bolt(in pic vvv) is supose to be grouned for the unit to work properly,will the teflon tape effect anything? any feedback on using these adapters?