I'm having lots of problems locating the correct tools for eg drilling and tapping an EGT gauge over here, can't find adapters with the threads that will go into the transmission pressure test ports (would like to have a male-male adapter) and this is really buggering me because you just can't finish some projects because aftermarket suppliers send the stuff in a way that will make you go to the hardware store and buy this little 2$ adapter to get it all together- no problem with that but the 900$ airline ticket to get to the store makes that a little tricky in my place. Ordering that stuff online is an option- if you know what the thread's called. Is there a book or something where I can find out the threads and the drill diameters etc for the trucks and especially for the aftermarket parts?

Any ideas are welcome!

AlpineRAM

 

Alpine, the tap size is 1/4 pipe, and the drill size for the tap would be 7/16

 

JYD is correct so the tap you need is called 1/4" NPT (national pipe thread)

 

Carefull some of the Autometer stuff is 1/8" NPT which is what I converted my ISSPRO pyro to The small pipe thread usually has a 11/32 drill start.

The 1/8 NPT thread is similar to a 3/8 NF thread. So if you have a 3/8 thread bolt its about the same diameter.

I have a drill conversion table, just not digital. I will do some digging.

 

how about this...?

 

Thats good, but I don't have an "R" in my drill index...

Need to convert from "R" to a fractional bit.

 

R = .339 = 11/32 (.344)

 

Right on.. Thats the drill I used..LOL..

Thanks..

 

be sure and get plugs to incase something breaks or you want to take it out later. better to have them than wish you did over there!