Wiring Gurus - Speedhut Gauge Question (1 Viewer)

Aeneiad

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I'm wiring up a Speedhut oil pressure and water temp gauge and I'm wondering if I can wire them directly to my Blue Sea fuse block for an ignition source? I've tapped into the cig lighter for a USB plug, if I can't wire the gauges to the fuse block, can all 3 be tapped into the cig lighter wiring? Last question (for this round), the wiring diagram has an inverter and both gauges can be plugged into one inverter. Do I need to connect the additional ground and dash lighting cables or can I use the one connection that both gauges are plugged into for the dash lighting / ground?

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Inverter
Inverter.jpg


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dirtyboots

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Positive circuit for Speedhut gauge needle illumination:
Yes you can hook the Speedhut gauges to either the sea fuse block or USB 12v power source. The gauge doesn't care where it gets positive 12v from. You should only connect the gauge to a circuit with an appropriately rated fuse. Having said that the blue sea block will be a much more satisfactory connection, you can put in whatever fuse you want, and easily diagnose any issues on that one circuit. Alternatively if you plumb in to the USB circuit, you've added another layer of wiring to sort out if there's an issue. The speedhut stuff is all LED so it's unlikely it would strain the USB circuit though.

Please disregard earlier needle negative circuit don't tap J5..gotta find my notes I was just looking and that was one of my bamillionth attempts to run the speedhut off the 80 rheostat somehow. Hopefully everything else makes sense and works.

The speedhut gauge face illumination:
Any positive and negative connection and it works only on speedhut's own rheostat which is hooked in to a DC to AC invertor from speedhut. You can try to hook everything in different ways, but trust me there is no way to run speedhut gauges on one factory 80 series rheostat. Good news is Speedhut will service any part that you roast here in the USA playing around with wiring and they will respond with helpful tips promptly.

Hope that helps.
 
Last edited:

Aeneiad

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Joined
Apr 28, 2020
Messages
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Location
Merrifield, Minnesota
Positive circuit for Speedhut gauge needle illumination:
Yes you can hook the Speedhut gauges to either the sea fuse block or USB 12v power source. The gauge doesn't care where it gets positive 12v from. You should only connect the gauge to a circuit with an appropriately rated fuse. Having said that the blue sea block will be a much more satisfactory connection, you can put in whatever fuse you want, and easily diagnose any issues on that one circuit. Alternatively if you plumb in to the USB circuit, you've added another layer of wiring to sort out if there's an issue. The speedhut stuff is all LED so it's unlikely it would strain the USB circuit though.


Negative circuit for Speedhut gauge needle illumination:
The cleanest way to hook up speedhut is to tap the J5 (negative) circuit of the 80 series illumination circuit. Go to Corsa Tech, buy some Yazaki 090ii series connectors, a cheap crimper, locate J5, learn how to de pin and re pin a wire in to the J5 connector, and have a robust connection for your Speedhut needle illumination that is tied in to your factory rheostat.

The speedhut gauge face illumination:
Any positive and negative connection and it works only on speedhut's own rheostat which is hooked in to a DC to AC invertor from speedhut. You can try to hook everything in different ways, but trust me there is no way to run speedhut gauges on one factory 80 series rheostat. Good news is Speedhut will service any part that you roast here in the USA playing around with wiring and they will respond with helpful tips promptly.

Hope that helps.


This helps a lot. Thanks dirtyboots!
 

dirtyboots

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@Aeneiad edited the negative needle illumination...IIRC it doesn't work correctly that way sorry for any confusion. To be sure if you tap the J5 with the neg needle the gauge is wonky unless you have the lights on with full illumination...all good otherwise...I gotta try and remember how I hooked the needle neg up now sorry man
 

dirtyboots

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Alright for anyone else searching this...final final per speedhut support and now looking back through notes...what I did is connected the speedhut inverter to J5 so that the face works with / on the 80 rheostat. Then I got some resistors and connected one in line with the white needle gauge wire to dim it a little. HTH
 

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