Finally finished converting my tachometer to electronic! Many thanks to Spyder for pioneering this and figuring out what aftermarket tach to buy that works for this conversion. Also, seeing that it could be, and had actually been, done gave me the confidence to start chopping.
The thread with all his pics and info is here:
viewtopic.php?t=15556
The first thing I did was buy this Autometer tach:
https://www.autometer.com/3-3-4-tach-8- ... black.html
Next, I gutted both tachs and swapped the electronic guts over to the Datsun tach. As Spyder noted in his thread, the circuit board will not fit in the stock Datsun housing, so extension wires must be added. My ignition box has a feature where it can send a steady RPM signal out to test tach accuracy, So, I hooked them up, set it to 4K, and then installed the needle. Tested it in all RPM ranges and it is spot on.
So far, so good! I got the wires all wrapped up, a grommet installed, and I made some extensions off the back of the gauge face out of a dowel so that the face would mount securely to the housing. Found a little box at Tap Plastic to house the circuit board and keep it safe. Made some small dowel mounts for it, too.
This ignition box also has an adjustable output to trigger a shift light, so I got a tiny, but really bright surface mount LED and mounted it at the bottom by the turn signal indicators. It's visible in the photo above as a small black square with a white circle on it. Pretty unobtrusive until it lights up:
Now I'm waiting for a few parts to finish my ammeter to voltmeter, and electronic oil pressure gauge conversions.
