I know everyone uses the extra hole on the left head and I know you can buy an adapter to fit an autometer gauge but Im using a mechanical gauge which is a 1/2" fitting. There is no adapter that reduced to the 12x1.5mm on the head. Is it safe to drill the hole bigger and rethread it?

I have an extention since the mechanical sensor is about 2" long. This will keep the sensor from going in the head too far and causing any possible clearance issues.

I didnt find any answers doing a search. Any help is appreciated.

 

A lot of people have drilled them for 3/8npt but I haven't heard of anyone going that big.

 

I would make an adapter personally before I drilled and tapped the hole any bigger. Get two correct ended adapters and weld em together.

 

run the electrical temp gauge and skip that mechanical would be my .02

 

That welding thing is a good idea but I think the sensor is too big in diameter to fit inthe existing hole along with the 12x1.5 adapter fitting

 

I was thinking about it but I already have $700+ in gauges and I can't return this one. I may just bite the bullet and do that though.

 

To the OP, sorry for the off topic post.

xpndbl3,
That's a sweet z28 you got there in your signature pic. Nice freakin' ride.

 

I drilled and tapped the right 243 head for an Autometer mechanical gauge where the metric plug was. It wound up being bigger than 1/2" if I remember correctly but the sensor fit all the way into the head with no problem. HTH.

 

sell the mechanical and get an electric.... 1/2 is big...

 

ebay it possibly?

thanks, if you pump tens of thousands of dollars into something eventually it pops out like that.

 

Yea I bit the bullet and got an electric one from ebay. Ended up saving $50 off the Jegs prices too. So if anyone needs a nice mechanical gauge i have one for sale lol.