My Isspro pryo guage is acting funny. When I start truck, needle
goes to 1500 then goes back down and doesn't work when truck runs.
anyone had this problem.

 

Mine used to jump around a bit. I got some dielectric grease in the connections and all is good now.

 

Mine is doing this now! Put the grease in which connections?

 

bump one time any other suggestions

 

Check your ground to make sure it is good. If I remember correctly the ISSPROs have an amplifier which could be suspect. Also make sure that the yellow and red wires where you attach the pyro are not making contact with one another...

 

Check all of your connections, including those to the thermocouple and the connectors into the amplifier box itself. If the connections are all good, and you're getting clean power and ground, then please arrange a return through the dealer you purchased it through. Please let me know what you find.

Thanks,
Michael Pliska

 

Look at that, ISSPRO on the site. Can't get much better support than that...

 

I've heard that using solder on the pyro wiring will cause erratic readings as well. FWIW. Double check your ground.