2 gauges off one sending unit, is it possible? - Pirate4x4.Com : 4x4 and Off-Road Forum

am4x4 · 03-27-2012, 10:38 PM

Actually it is one gauge and an ecu. Long story is I am swapping a tundra motor into an FJ40, the tundra wiring runs the gauge signals through the ecu so I assume it wants to see them. There is an output from the ecu to the tundra instrument pack but I suspect it is a computer mumbo jumbo signal rather than a simple sender resistance signal. I want to run the factory FJ40 gauge cluster and I am wondering if it is going to screw with anything if I try to run two things off one sender. I know senders work off resistance to ground and it seems like it would be ok but I am doubting myself.

TR · 03-29-2012, 08:58 AM

than Likely the tundra temp sender is a 3 wire type and would not work with your cluster. Does the ecu have a seperate temp pin to the cluster? You will probably be better off adding the fj40 sender to the engine some where.

egdinger · 03-31-2012, 11:55 AM

Without knowing more about the ECU and sensor, I'm going to say that you probably can't do what you want to do. In fact trying to may even damage the ECU.

03-27-2012, 10:38 PM	#1 (permalink)
am4x4 Rock God Join Date: Jul 2005 Member # 50177 Location: simi valley, CA Posts: 1,545	2 gauges off one sending unit, is it possible? Actually it is one gauge and an ecu. Long story is I am swapping a tundra motor into an FJ40, the tundra wiring runs the gauge signals through the ecu so I assume it wants to see them. There is an output from the ecu to the tundra instrument pack but I suspect it is a computer mumbo jumbo signal rather than a simple sender resistance signal. I want to run the factory FJ40 gauge cluster and I am wondering if it is going to screw with anything if I try to run two things off one sender. I know senders work off resistance to ground and it seems like it would be ok but I am doubting myself. __________________ Toyota Link Suspension Systems, Weld On Beadlocks, Custom Fabrication, and More www.MayhemMetalWorks.com ________________________________________________ 05 GMC 2500HD d-max, 87 4runner, X chassis rock buggy my buggy build http://www.pirate4x4.com/forum/showt...e33fc&t=488938

03-29-2012, 08:58 AM	#2 (permalink)
TR Zeus of the Sluice Join Date: Jan 2001 Member # 2877 Location: Gordonsville, Va Posts: 3,502	than Likely the tundra temp sender is a 3 wire type and would not work with your cluster. Does the ecu have a seperate temp pin to the cluster? You will probably be better off adding the fj40 sender to the engine some where. __________________ Penn State study finds that heavy drinking is 100% easier than giving a shit

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03-31-2012, 11:55 AM	#3 (permalink)
egdinger Registered User Join Date: Nov 2005 Member # 62360 Posts: 15	Without knowing more about the ECU and sensor, I'm going to say that you probably can't do what you want to do. In fact trying to may even damage the ECU.