LarryJ

I'm trying to install my guages and I think I have the wrong thermocouple from Isspro. It is their number R650 and it has a 1/4 inch threaded nut on it. I though they were supposed to be 1/8 and mine is about 2 inches long from the bottom of the threads to the tip..am I missing something or did they spec me the wrong part. I forgot the 7 P's and didn't look ahead to make sure before I drilled the hole. I drilled and tapped for a 1/8 NPT (pre turbo) I guess I can plug it with a brass pipe plug until I figure out what is wrong or until I can get the right one in. Does anyone know the right part number? ??? T.I.A.

scottrod

Mine is R658S

Shovelhead

Mine looked like this


and is adjustable for length by loosening the ferrule and sliding the thermo. up or down.

Dr. Evil

Which p/n is that???

Shovelhead

[quote author=Dr. Evil link=board=7;threadid=23403;start=0#msg219762 date=1070840536]
Which p/n is that???
[/quote]

R658 THERMOCOUPLE ADJUSTABLE
www.isspro.com

LarryJ

yep, looks like mine is the wrong part number. It's not adjustable but looks like yours Shovelhead. Is yours 1/8 or 1/4?

Shovelhead

1/8"
Rod set me up with the whole enchalada. ;D

LarryJ

I got mine at eguages.com because Rod was out of them and didn't know when he would have a couple of the three guages I wanted in. I dont even see that part number on eguages site so guess Ill need to call them and set up an exchange..
thanks for the info. I cant see doing a 1/4 inch hole in the manifold so I can't adapt this one to fit..
thanks folks

Shovelhead

They should be able to get you the same in a 1/4"

Olratlr

I have a 2001- Used R658S Isspro

LarryJ

thanks folks, I either need the 658 or the 658s not sure which but I have the 1/4 now and want the one I can use with a 1/8 npt hole.

scottrod

Larry- the s stands for short. That would be the one you want.

LarryJ

658s thanks, Ill start the exchange process tomorrow..jees, I must want guages really bad lol..

J BODY

Just curious....is it ok to drill and tap a 1/4' in the exhaust manifold?

Dr. Evil

I think so...Ive seen guys drill and tap 1/4" NPT then use a 1/4"X1/8" bushing to install the thermocouple probe.....I dont see a problem as long as you use some high temperature antiseize on the threads....