I got the SGI100BT installed and am having trouble getting the tach working. To verify that the actual tachometer itself works, I hooked the tach signal from the Holley directly up to the tachometer (no SGI100BT). It works and reads rpm (although low). Keep in mind I have the 330ohm resistor soldered in per the following link
http://www.jaguarspecialties.com/tech_tips3.asp
With the SGI-100BT installed inline, the tach doesn't work. It has a good 12V switched power source and ground and turns on with the ignition. When I hold the SET button with the engine running it shows a number bouncing between 048 and 052, which rises with RPMS. I assume that means it has a good input signal from the Holley. I confirmed this by verifying that I have a 14V AC signal on the input wire from the Holley. However, the tach still does not work. I tried both the Normal and High Voltage outputs per the diagnostic guide but didn't have any luck.
So in summary, I know I have a good input signal and a good tachometer.
The only thing I can think of is a setup error that I'm missing, or that the tach has a 330ohm pull-up resistor soldered in.
http://www.jaguarspecialties.com/tech_tips3.asp
With the SGI-100BT installed inline, the tach doesn't work. It has a good 12V switched power source and ground and turns on with the ignition. When I hold the SET button with the engine running it shows a number bouncing between 048 and 052, which rises with RPMS. I assume that means it has a good input signal from the Holley. I confirmed this by verifying that I have a 14V AC signal on the input wire from the Holley. However, the tach still does not work. I tried both the Normal and High Voltage outputs per the diagnostic guide but didn't have any luck.
So in summary, I know I have a good input signal and a good tachometer.
The only thing I can think of is a setup error that I'm missing, or that the tach has a 330ohm pull-up resistor soldered in.