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Just installed the gauge and turned the key over expecting the gauge to peg to 100 then return to zero before starting truck. The red light comes on and needle doesn't move. Drive down the road about a mile and the gauge starts reading 60psi (good it's working so I thought). Drive across town and park, turn truck off and gauge stays at 60. Go shopping about hour later gauge still at 60, start truck. Turn lights on and gauge has no backlight. Run voltage tests. 12v on the red switched wire with key on. No voltage with key off. The orange dimmer wire only has continuity with the lights turned on. So far so good.
I'm wondering if I have a bad gauge or does the ISSPRO need to be programmed with the optional software? I just ordered a single gauge as the truck came with boost, trans temp, EGT, and coolant temp gauges already installed. I did not tap into any of the existing gauges (daisy chained) instead ran a ground and add a circuit fuse to the fuse panel directly to the ISSPRO gauge. I have checked and double checked the wires pushed into the Orange 6 pin connector in the back of the gauge. Can't figure out why the gauge doesn't return to zero with truck turned off?????
ISSPRO gauges stay at the last indicated reading when the truck is shut down and they will remain so until the truck is restarted. When you restart the truck, the needles will sweep to max then settle back to the current reading. Nothing wrong with the gauge, that's how they are suppose to work.
My gauge doesn't zero out on start up. It also takes a few minutes for the gauge to start registering fuel pressures. I assumed that once the key was turned over it (waiting for glow plugs to heat up) it would zero out and it doesn't. The needle doesn't move until I drive down the road about a mile then starts registering and the needle moves. I relocated my ground to the bare metal bar at the bottom of the fuse panel cover made no difference.
With the lights turned on and dimmer switch turned all the way up before the dome light comes on I still have no backlight. This is an EV2 gauge is it supposed to zero out on start up or with ignition turned on? Since the gauge is electronic it makes sense it will stay where it last read after truck turned off. I'm just used to mechanical gauges that once pressure drops the needle responds instantly.
No backlight? It works or it doesn't - it's not part of the electronics for the gauge indicator. I can have a totally dead gauge and the backlight will still work if it has voltage to that pin and a solid ground.
I must now ask how you punched down the wires on the connector. Was it with that plastic "comb"? I hate that thing, I had to use Channel Locks to get it to really punch down. I used a tiny flat-bladed screwdriver to fix a couple of connections on my EGT gauges, that bare wire is precisely that - a bear.
When you check your voltages/ground, are you using a paperclip to get your meter probe to test inside the connector socket?
Does your color code match mine on the connectors (Boost is the same as Fuel Pressure)?
Like suggested, make sure the wires on the back of the gauge are making contact...
If that doesn't work you can run a jumper wire from the pos & neg bat to the power & ground wures if the gauge. See if it zero's out & operates like it's supposed to.
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