Brass is acceptable, but I have very little in contact w/VO. TIH is easily made using a 3/4" tee, nipples (or hose barbs) and a compression fitting - for each end. The tubing exits the tee thru a compression fitting (ya must drill out the 'stop' in comp. fitting). The coolant flows around tubing in hose and exits the other side of tee. I've used black iron tee's and 4" nipples cut in 1/2 for barbs for a few years now... The 'aircraft' alum tubing I use is about $1/ft at McMaster.com (3/8" rated for like 1400psi iirc?)
Here's a pic:
This is the other end. I used a 90 on the coolant side so everything goes in the same direction. No hose clamps installed yet in this pic...
You are shooting for 160* + VO before the engine. Any less is risking a slow, miserable death for your engine from carbon build-up/coking. I suggest at least a heated fuel pick-up (Hot Fox or similar), TIH fuel lines including a looped return, and at a 16 plate FPHE. The HOTTER the VO before the VO filter, the better! (or filter life will suffer)
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Choose wisely. Or PLEASE post pics of the carnage!!!
2001 F-350, DRW, 4x4, XLT Crew Cab, flat bed, 7.3, 6 spd, Dipricol Optix gauges on pillar - EGT, Boost, Fuel Press., HPO Press. - No Muffler, AIH delete, SB Con OFE, AC code injctrs, GTP 38R. Vegistroke-inspired WVO system w/150,000 trouble-free miles! BTS tunes, 203 t-stat w/billet housing, Evans coolant, coolant filter, boost relief valve, Dieselsite IC boots, Hella headlight harness, '07 grill/lites and big, bad front bumper!
2000 Excursion 4x4 Limited - BTS trans and tunes, AIS, Frybrid/V3 SVO conversion with over 100k VO miles so far!
That's 250k miles on SVO between them! 
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