Attention: TDR Forum Junkies 
Hey all,
I just put an Isspro tach in my truck, and I'm having some problems with it. I figured I'd check here while I wait for their tech support to get back to me (if they ever do... been waiting since Monday), maybe somebody else has had this same issue.
I have the EV2 tach, ISS-R12502 from Geno's garage, and the 92-93 wiring adapter.
At first, I followed the instructions and hooked it up using the yellow wire to the truck's harness, but the tach bounced all over the place if it worked at all, and would jump wildly when I blipped the throttle.
So, I swapped it for the white wire, and it "works" somewhat now. When I cranked the truck the first time after swapping the wires, it worked fine, 750-800 idle in gear with the a/c on, and seemed to register correctly when I gave it some gas.
But when I shut the truck off, it went to 1,500 RPM and stayed there after I took the key out. I cranked it again, and it was idling at 1,500, and seemed to use that as it's baseline. I was cruising at 2,200 RPM at 50 MPH, and it never went below 1,500 RPM.
When I shut it off next time, it stayed at 1,500 RPM. I turned the engine off/on and now it's reading correctly at idle.
Next time I tried cycling the key on/off before cranking it, and the needle went to zero, and it read the correct idle speed. That worked for a couple days, but now I have to turn the key on/off several times before it will read correctly. One time it started reading incorrectly while I was driving after it was reading correctly when I first cranked it.
Any suggestions? Oh, it's grounded to the back of the stereo, along with my clearance lights and my other gauges, and they are all working fine, so it's probably not a ground issue.
I just put an Isspro tach in my truck, and I'm having some problems with it. I figured I'd check here while I wait for their tech support to get back to me (if they ever do... been waiting since Monday), maybe somebody else has had this same issue.
I have the EV2 tach, ISS-R12502 from Geno's garage, and the 92-93 wiring adapter.
At first, I followed the instructions and hooked it up using the yellow wire to the truck's harness, but the tach bounced all over the place if it worked at all, and would jump wildly when I blipped the throttle.
So, I swapped it for the white wire, and it "works" somewhat now. When I cranked the truck the first time after swapping the wires, it worked fine, 750-800 idle in gear with the a/c on, and seemed to register correctly when I gave it some gas.
But when I shut the truck off, it went to 1,500 RPM and stayed there after I took the key out. I cranked it again, and it was idling at 1,500, and seemed to use that as it's baseline. I was cruising at 2,200 RPM at 50 MPH, and it never went below 1,500 RPM.
When I shut it off next time, it stayed at 1,500 RPM. I turned the engine off/on and now it's reading correctly at idle.
Next time I tried cycling the key on/off before cranking it, and the needle went to zero, and it read the correct idle speed. That worked for a couple days, but now I have to turn the key on/off several times before it will read correctly. One time it started reading incorrectly while I was driving after it was reading correctly when I first cranked it.
Any suggestions? Oh, it's grounded to the back of the stereo, along with my clearance lights and my other gauges, and they are all working fine, so it's probably not a ground issue.
