I have a isspro pyro that sticks at about 350. You can tap the face and it will rise a bit gut never as high as I think it should. It is the type with the black box under the dash. It was in the truck when I bought it. so I dont have the history on it.

Ideas?

Thanks

 

Contact Isspro.

I've had good dealings with them on a warranty problem with my Trans Temp gauge.

www.isspro.com

 

I have a similar problem, usually when very cold (below freezing). The pyro will not come off the pin until I apply a liberal smack to that little black box under the dash.

 

Prob amp box failure in conjunction with losing a little washer on the back face of the needle. Have had that happen before the washer came off, and the gauge would only go to about 500 or so before it would just lose grip and stop.