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Hmmmmm........ I thought it was against the forum rules to post links to any Ebay auction. Am I wrong?

Ditto Winston. I have 2 of those tachs. A step by step guide will be most appreciated. Also did you have to cut out the back of the cluster housing?

Hey Winston - did you figure out how to get the tach to work?

What do you think about abandoning the thought of using the alternator as the signal source and instead use an aftermarket crankshaft position sensor? These are readily available and attach to the timing index plate next to the harmonic balancer.

Thanks for your determined efforts. Please keep us posted.

Thanks Winston. Please let us all know how you get this thing to work.

OK here are a few close-up photos of my new Delco 4000 rpm tach. The little "switch" on the back is actually a plastic plug designed to be inserted or left out. Included in the Delco box with my new tach is a small brown folder with 4 of these plugs. Not sure why there are 4, as only 2 can be...

i opened the DELCO box today of my NOS 4000 rpm tach and discovered that switch on the back is not actually a switch at all. I believe I have it figured out and will post photos and my theory tomorrow.

What I had intended to do, and still plan to do, is to temporarily wire the tach with it laying on a bench beside the truck and the truck running. I actually have 2 of these things, 1 older tach still mounted it a mid-1980’s cluster, and another NOS unit still in its GM box. Both tachs appear to...

i have one of those 4000 rpm tachs but haven’t installed it yet. If I remember correctly the plug on the back has 3 wires, one is a 12v hot, another for the tach signal, and the third as a ground. I’d suggest you make sure it is grounded properly. Also, there is a little switch on the back which...

jsd563 - due to career duties, I will not be able to install my C-60 4000 rpm GM tach until later in the spring. I will post photos of the process as I get into it.

Rich - I obtained one of those 4000 RPM Medium Duty Truck tachs with the small fuel gauge and plan to begin installation soon. I will abandon the seat belt and brake warning lights and modify the fuel gauge wiring so it will work. It would be very helpful if you could post the Dakota Digital...

48cj2a - I just scored on one of those 4000 RPM Medium Duty Truck tachs with the small fuel gauge. Not NOS, but a nice clean used unit from an '84 Chevy C6500. The numbers and needle match my M1028 gauges perfectly. Now I need to figure out how to make it work. The first thing to determine...

48cj2a - would you happen to have the GM part number of that 4000 rpm tach with fuel gauge? I have a long-distance source for a few NOS tachs but he doesn't know what they fit and doesn't want to open the boxes. Thanks in advance.