I installed indiglo gauges in my 97 Z28 and i had to take the needles off too put them on and i tihnk there alittle off i put them back to the way they were when i took them off but i tihnk there still off anyway to check them all and make sure????

 

Im interested in this as well.

 

You can compare the coolant temp, RPM, MPH and volts to the readings from the PCM (use a scanner), to get the correct readings.

For the fuel gauge, fill it up and make sure the needle is above the "F" if that's the way yours used to be. For oil pressure, put a mechanical gauge on it (port above the oil filter) to get the correct reading.

The only weak point in the above is the volt meter. The PCM "system voltage" and the volt meter reading seldom agree, possibly because they are picking up the voltage from different points. You could also check system voltage at the alternator.

 

well i tihnk i got them all right now except i think the speedos 5mph more than its supposed to be but that might not be bad, save me sum tickets, the gas gauge was never right cause it would go down to E and it would be empty no check gauges light or nutuhn

 

There is no "check gauges" for low fuel. Normal for the gas gauge to show "1/2" with only about 5 gallons left, and "1/4" with only 1 to 1.5 gallons left.

For the speedo, take it out on a freeway with mile markers. Hold it at a constant 60mph, and time 1 mile with a stopwatch. If it isn't 60-seconds, the speedo is off. Calculate the required correction from the actual stopwatch reading.

 

oh i didnt know my buddy said his light came on when it got low, to recalibrate it should i fill the tank then put the needle right on the F cause right now it all the way over touching the bezel

 

Here is how I fixed my MPH and RPM needles. Put your key in and turn it half way on (to where your needles jump up into "ready" position). Your RPM needle should be on the 0. Since the guage overlay doesn't have a "0" mph, (mine starts at 5), I just estimated where the 0 would be and put the needle there.

 

I think that the 2000 and later F-bods came with the low gas warning light. Before that....you just have to guess....anyone wanna confirm this?