Assud

I know the size of the tap is 3/8-18 and im pretty sure the drillbit size is 37/64. But what i want to make sure of is that im using the same size tap/drill bit that everyone else did. Let me know what size tap/bit you used for the hole and maybe provide a picture or something for my viewing pleasure. Ive searched, done it all, just double checking now

DaleClark

iTrader: (55)

Actually, I believe the thread for the sender should be NPT or BSPT pipe thread. Check the manual on Defi's site (http://www.defi-shop.com) if you don't have yours - I know it's listed in the manual. You definitely don't want a straight thread - you need the tapered pipe thread to do the job right.

BTW, NPT = National Pipe Thread, the US standard. BSPT = British Standard Pipe Thread, which is the metric version. Most all Japanese senders are 1/8" size - funny thing is it's 1/8" BSPT - you'd figure it would be a metric size, not 1/8 inch .

Can't remember what drill bit goes with the pipe thread taps - I always Google it when I forget .

Dale

Sgtblue

iTrader: (16)

https://www.rx7club.com/showthread.p...hlight=install

Looks like 1/8-27 and 11/32" bit size is what you need. And this thread has pictures.

Assud

Ive already read through that thread, the problem is that the temp sender on the DEFI gauge is not 1/8, its 3/8, so that FAQ is all wrong as far as specs go. a 3/8-18 NPT cap fits on the tap and on the sender perfectly, so im pretty sure this is the right size. Maybe this is an older revision? Should my sensor be 1/8 instead of 3/8? I bought the gauge used from Fritz so it didnt come with a manual. Thanks for the help guys, hopefully somebody who already had this fiasco will chime in and fix all my problems

steve-z

I just installed a Defi D Gauge yesterday for water temp, it was definately 1/8-27, although the other lines of Defi gauges may be different.