Dave Plummer

My LS3 has a screw-in fitting where I'd like to install my analog temp gauge sender, but it doesn't seem to be normal pipe thread. It's very, very close but is it metric?

I don't have the flat boss on top, and my pump outlet is over to the driver's side.

Thanks,
Dave

Crf450r420

iTrader: (1)

It's M16 x 1.5 straight threads. You would have to tap it, probably to 1/2" NPT and run a reducer to 3/8" or you can try drilling and tapping that steel plug.

Dave Plummer

Thanks! I tapped it out to 3/8 NPT without even drilling it, seemed there was enough meat for that, and it looks like it'll be solid.

Crf450r420

iTrader: (1)

no problem

Dave Plummer

In case anyone wants to do it without tapping their pump, you can't go wrong with a bag of Metric-SAE adapters for $10 delivered!

http://smile.amazon.com/gp/product/B...f_rd_i=desktop

Crf450r420

iTrader: (1)

If you can work with 1/8" Autometer also makes an oil pressure adapter, but you would also have to drill and tap it since temp senders usually come in either 3/8 or 1/4. Tapping the aluminum is way easier than tapping that brass.

Dave Plummer

The last sender I tapped (before this) was the big 13/16" temp sender on an iron intake manifold. Suffice to say, the small aluminum port as much easier...