Anyone know what the thread size is of the 1275 water temp gauge sending unit (on the block)? It doesn't appear to be NPT (duh) but I heard from a motorhead friend that it might not be metric either.

I'm trying to connect up aftermarket gauges and I need to locate or make an adapter to convert to 1/8-27 NPT.

Similarly, the I would love to know the oil pressure sending unit thread size as well.

Thanks for any helpful info!
Jeff

 

Oil is 1/4" NPT, I think. The brass fittings sold at Home Depot or Lowes will work. That's whats on mine. Install a Tee and you can have both an idiot light and a mechanical guage.

The H2O is an odd size, but NPT. I install a SUNPRO guage set and while it had the correct size adapter it wasn't long enough. I ended up placing an "O" ring around the temp sender bulb to seal it in the head.