Engine oil and jacket temp gauge replacement (1 Viewer)

Joined
Jan 2, 2020
Messages
11
Location
QLD,Australia
Hey,

I have 1981 2H engine

I just purchased PWT gauge from red arc. Found a shop that makes reducers but unsure of cylinder head thread is.

Cylinder head size looks maybe around a m18x1.5

the oil sender I think just needs a 1/8” bspt to 1/8” Npt adapter.

this is the OEM oil pressure sender

redarc sender threads are 1/8” npt
C6305DD5-39B2-4E7D-B259-9EB7DC88D210.png


a replacement water jacket sender
EB812199-D045-4C21-BA7E-3C697E4271DB.png
 
Last edited:
Joined
Jan 2, 2020
Messages
11
Location
QLD,Australia
NPT = 27 threads/inch. BSPT = 28. You need extraordinary vision to discern the difference!

Are you certain that the new sender has tapered threads?


well redarc data sheet saying 1/8” NPT,
It doesn’t look tapered though which is confusing me,

im really chasing the block thread and size

below is the jacket water temp port I want to.
BD80CD7A-CEDD-4508-8A42-325D3785DA04.png
 
Last edited:

73FJ40

After another night of rust removal!
SILVER Star
Joined
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Messages
1,543
Location
Western Massachusetts
@47HUNDR

It's likely the threads on the water jacket are BSPT as well.

BSPP / BSPT​

BRITISH STANDARD PIPE PARALLEL / BRITISH STANDARD PIPE TAPER

55 Degree Threads


SIZE
TPI
MAJOR (EXT)
MINOR (INT)
TAP DRILL
1/8"
28​
9.728​
8.566​
8.70​
1/4"
19​
13.157​
11.445​
11.60​
3/8"
19​
16.662​
14.950​
15.00​
1/2"
14​
20.955​
18.631​
19.00​
5/8"
14​
22.911​
20.587​
20.75​
 
Joined
Jan 2, 2020
Messages
11
Location
QLD,Australia
@47HUNDR

It's likely the threads on the water jacket are BSPT as well.

BSPP / BSPT​

BRITISH STANDARD PIPE PARALLEL / BRITISH STANDARD PIPE TAPER

55 Degree Threads


SIZE
TPI
MAJOR (EXT)
MINOR (INT)
TAP DRILL
1/8"
28​
9.728​
8.566​
8.70​
1/4"
19​
13.157​
11.445​
11.60​
3/8"
19​
16.662​
14.950​
15.00​
1/2"
14​
20.955​
18.631​
19.00​
5/8"
14​
22.911​
20.587​
20.75​
Are those metric measurements on the major and minor column?
 
Joined
Jan 2, 2020
Messages
11
Location
QLD,Australia
Ordered some fittings through speed flow,
Oil pressure sender 1/8” bspt male to 1/8” npt female adapter

water jacket
There’s a spare plug that the previous owner had a mechanical temp gauge wired in and from what I’ve found going off part number looks like a M18x1.5

so I’ve gone a M18x1.5 to 1/8”npt reducer.
 

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