I have a '98 FLD120 w/3406E n I want to put a pyrometer in. Do I have to use a freightliner wiring harness or will anything work? I have a probe (sending unit) from an international n was hoping that might work. There is 2 wires comin out of it n I assume 1 goes to a gauge n the other to a power source?
Installing a pyrometer
Discussion in 'Trucks [ Eighteen Wheelers ]' started by CbarM, Aug 13, 2013.
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The sender you have should work. Both of those wires go to the gauge. All you need is the wire going from the sender to the gauge and a mechanical pyrometer.
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How does the gauge get power? I dont fully understand...
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I put in an Autometer pyro and they say you have to use the wire harness just the way it comes, you can not cut it to length. Not sure how the factory pyro's work but I would think they would be similar.
Bill -
The gauge doesn't need power, the probe (most likely a K type thermocouple) creates the voltage for the gauge.
When you install it, you will have to drill and tap the hole in the exhaust manifold (if it is before the turbo, be careful not to get the metal chips into the manifold), then you can install it in the manifold.
The problem with trucks is that most likely you will need to extend the probe's wiring which is not done with anything but thermocouple wire and you have to put the right lugs on the ends then connect them with a nut and bolt to get accurate readings.
Hope that helps. -
Ohhh...so its not just a matter of crimpin on a couple butt connectors to make it longer?
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The connectors do matter too, you can order it in any length but there is a limit to it.
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Do not use butt connectors. They will alter the reading.
Buy a Autometer gauge from Summit Racing. Instructions will be included -
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