Okay i have my stock wiring for the coolant temp. I splice another wire to an aftermarket gauge and the gauge is reading nothing. What could be the issue?

 

if i'm not mistaken, that sensor runs off of ohm resistance. Does the sensor share a rating (cold or hot) as the new guage you put in? I believe that the box for the guage should have this information for reference.

 

are you trying to run both at the same time? or just the aftermarket one. because if i remember correctly when installing my autometer temp gauge, they would not work simultaneously. you have to wire up just one or the other. also, are you using the aftermarket temp sender?

 

Aftermarket gauges usually cannot be used with the stock sensors (different ohm ratings), unless they explicitly mention that.

Also, multiple gauges cannot be connected to a single sensor, then both gauges will show incorrectly. One gauge per sensor.

Hope this helps.
Lou

 

Anyone got a 'how to' on installing an aftermarket temperature gauge?

 

If you are adding an aftermarket temperature guage, you need to drill and tap a hole on the block side of the thermostat or somewhere in the block or head water jacket. Then install the aftermarket sensor and wire it to the aftermarket guage. I have done this and it works well.