WickedWild Posted May 4, 2004 Share Posted May 4, 2004 If my JTR book was not in some obscure box in storage I would not have to ask this question, but… What is the resistor value for running from a Chevy distributor to the Datsun tachometer? Thanks Quote Link to comment Share on other sites More sharing options...
Guest 77vegasz Posted May 4, 2004 Share Posted May 4, 2004 I will get the book out when I get home, but I remember that the resistor is only needed on the 240 tach, the 280 tach is a straight wire up. Jon Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted May 5, 2004 Share Posted May 5, 2004 15K ohms 1/2 watt This is for the HEI distributor. You have to use the 260/280 guts in a 240 tach. You have to use the resistor or the needle will bounce all over the place. Quote Link to comment Share on other sites More sharing options...
WickedWild Posted May 6, 2004 Author Share Posted May 6, 2004 So the guts of the 280 tach are worthless. I have a slew of spare parts that came with the car, one of them is a tach. How can you tell the 240 tach from the 280 tach? Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted May 6, 2004 Share Posted May 6, 2004 The guts of the 260/280 go in the 240 tach - the 240 guts are worthless... Quote Link to comment Share on other sites More sharing options...
WickedWild Posted May 6, 2004 Author Share Posted May 6, 2004 The guts of the 260/280 go in the 240 tach - the 240 guts are worthless... Yea.. Man it's just one of those days Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted May 7, 2004 Share Posted May 7, 2004 I just noticed you asked how to tell the two apart. If you have a 280, then all you need to do is the resistor and adjust the calibration screw. If you really need to konw which one you've got, in looking at the JTR manual, the 240 tach has what looks like light colored wires on the right side of the tach (about the 3 o'clock position) when looking at the back of it The 260/280 tach seems to have only one dark wire coming out of that spot..... That and the 260/280 tach looks like it has a built in bracket on the bottom coming 'up' from the edge. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.