Compression Ignition Addict
Join Date: Oct 2008
Location: Hudson Valley, NY region
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I use an Autometer GS 1/2 sweep electric guage. It matches the stock panel nicely both day and night. I got it on fleabay for $70-ish and an extra temp sender (get the longer one - there's two versions) that works with the electric 1/2 sweep guages for another $20-ish, I think. I installed a $3 microswitch from Radio Shack that allows me to use the one temp guage to switch between coolant temp and veg oil temp. Pics in my thread about how I upgraded the heat in my V3 system on here.
For the coolant line, you can put it in with a tee (and I also put a ball valve there to shut of heat to the tank). The Autometer temp sender needs a ground, so either ground the valve or thread a slot in the tee for a little screw that you can attach a ground wire to the engine. You already have the veg oil temp in the ideal spot, so a longer probe might help you get a slightly faster reading. Again, the Autometer sender needs a ground, so you can either add a ball valve (stainless would be best on the veg fuel line) or thread a screw into the tee for a ground wire.
FYI, the veg oil temp does rise slower than the coolant temp - especially in the winter when the VO is frozen in the tank to begin with.
'02 7.3L Excursion Limited; ~160Kmi total; ~75Kmi on WVO
Vegistroke V3 (4/09); HIH, Aux Pump, FPHE (11/10); PHP Gryphon custom; 6637;
WW; Turbomaster; EBPV delete; 4" exhaust; Terminator HPOP; Tru-cool; Evans NPG+;
ARI triple-disc TC; V/B-code springs; Bilsteins; 30mm sway bar; 190A alternator; F650 dash, etc.